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2019-2020年高中英语Unit1Grammar练习新人教版必修2非谓语动词,主要指在句中表示一个动作但不能充当谓语,而是充当其他语法功能的词非谓语动词有三种动词不定式、动名词和分词包括现在分词和过去分词,现在分词和动名词也可统称为动词的-ing形式非谓语动词没有人称和数的变化,但是有语态和时态的变化动词不定式考点一动词不定式的基本形式时态构成被动形式一般式完成式进行式todotohavedonetobedoingtobedonetohavebeendone——1.动词不定式的一般式一般式表示的动作通常与主要谓语所表示的动作状态同时几乎同时发生,或是在它之后发生如Theyinvitedustogotherethissummer.他们邀请我们今年夏天去那儿2.动词不定式的完成式完成式表示的动作或状态发生在谓语动词表示的动作或状态之前如Iamsorrytohavekeptyouwaiting.=IamsorrythatIhavekeptyouwaiting.3.动词不定式的进行式进行式表示的动作或状态在谓语动词表示的动作或状态发生时正在进行如Theypretendedtobeworkingveryhard.他们假装在努力工作4动词不定式的被动式Thenextthingtobedoneistogetourclassroompainted.下一步要做的事是把我们的教室粉刷一次5.动词不定式的完成被动式Sheseemstohavebeentoldeverything.看来她都知道了6.动词不定式的否定式动词不定式的否定式是在to前面加not,有时强调也用never如Shedecidednottobelateagain.她决定不再迟到了Hepromisesnevertomakesuchastupidmistake.他许诺不再犯这样愚蠢的错误了考点二动词不定式的基本用法动词不定式具有副词、形容词和名词的特征,因此在句中可作状语、定语、宾语、宾语补足语、表语和主语等成分1.作主语如Tosavetimeistolengthenlife.节约时间就等于延长了人的生命但是这种句子实际上不多见现代英语倾向于用it作形式主语,而把真正的主语不定式后置如Itwouldbebesttotellhimthetruth.最好把真实情况告诉他ItisquitenecessaryforustolearnEnglishwell.我们学好英语很有必要注意在“Itis/was+形容词+不定式的复合结构”句型中,若形容词侧重于评价人物的特性、特征,则构成不定式复合结构的介词应为ofIt’sverykindofyoutohelpme.谢谢你帮助我2.作表语如Hisgreatestwishwastobeafamousartist.他的最大愿望是成为一位著名的艺术家3.作宾语如Theydecidedtobegintheexperimentatonce.他们决定马上开始那项试验另外,在某些动词后,可用it作形式宾语,然后加宾语补足语,最后加不定式作真正宾语常见的动词有find,thinkconsider,feel,make等如Theyfinditdifficulttorepaythemoney.他们发现还钱有些困难Doyouthinkitpossibletofinishtheworkintime你认为及时完成这项任务有可能吗4.作补语如PleaseaskJohntoturnonthelight.请让约翰开灯宾补在被动语态的句子中即成为主语补足语1在很多动词后都可以用不定式作宾补如ask,want,invite,get,force,expect,allow,persuade,order,warn,remind,prefer,cause,permit,forbid,advise,teach等如HeencouragedmetotalktohiminEnglish.他鼓励我用英语同他谈话2在使役动词make,have,let和感官动词see,watch,notice,observe,feel,hear,listento,lookat等动词后接不定式作宾补,不定式不带to,表示做某事的全过程当它们转换成被动语态时,作为主语补足语的不定式必须带to如Nobodysawhimein.没人看见他进来Shewasseentoentertheroomlastnight.3在动词help后,作宾补和宾语的不定式符号to带不带都可以如Heoftenhelpstodosomehouseworkathome.他经常在家帮着做家务4在think,consider,believe,suppose,feel,find,imagine,prove等动词的宾语后可以带tobe结构,也可省略tobe这种结构在书面语中用得较多如果不定式的动作发生在谓语动词之前,常用不定式的完成式如Theyfoundtheanswertobesatisfactory.他们对答复感到满意Weconsideredhimtohaveactedcxcellently.我们认为他干得很出色5.作定语1动词不定式作定语时,须放在被修饰的名词或代词的后面如Hesaidhehadanimportantmeetingtoattend.他说他有一个重要的会议要参加2如果不定式是不及物动词,后面就应有必要的介词如Givemeapieceofpapertowriteon.给我一张纸写字Heislookingforaroomtolivein.他在寻找一间居住的房子注意用作定语的不定式为“动词+介词”时,介词不能省略如apieceofpapertowriteon一张可写字的纸aniceplacetolivein一个居住的好地方3当名词被first,last,second以及only等词修饰时,其后可用不定式作定语且充当定语的不定式不含有将来意义或情态意义,却经常含有过去时意义Shewasthefirstpersontoe.她是第一个来的Theywerethelastgueststoarrive.4用不定式的主动式或被动式作定语表达的意义不同如Doyouhaveanythingtotaketothelibrary你有什么东西需要拿到图书馆去吗你亲自拿去Doyouhaveanythingtobetakentothelibrary你有什么东西需要带到图书馆去吗由别人带去5therebe句型中修饰主语时,用主动式或被动式均可如There’salotofworktodo/tobedone.有许多工作要做Therearesixletterstowrite/tobewrittentoday.今天有6封信要写注意句中不定式如有逻辑主语,则只用主动语态如Thereisnothingformetodotoday.今天我没有什么事可做6.作状语不定式常可用来作状语,修饰动词,表示行为目的、结果、原因等1作目的状语如Iopenedthewindowtoletfreshairin.我打开窗户好让新鲜空气进来不定式表目的时,也常用在inordernottodo或soasnottodo这种结构中,但soasnottodo这一结构不用在句首2作结果状语only常用在不定式的前面,作结果状语它常常表示出乎意料的结果,而用现在分词作结果状语则表示自然的结果Hehurriedtothestationonlytofindthetraingone.他匆匆忙忙地赶到火车站,发现火车已经开走了Alotofgoodlandhasgonewiththem,leavingonlysand.许多好的绿地也随之消失了,留下的只是沙漠3作原因状语动词不定式也可用在作表语用的形容词后作状语,说明产生的原因常见的形容词有sorry,surprised,glad,willing,eager.ready,content,anxious等如I’msorrytogiveyoutrouble.很抱歉我要给你添麻烦考点三动词不定式的省略1.当几个动词不定式作为并列成分出现在句中时,只在第一个不定式前加上to,其他不定式前的to均可省略Heaskedmetoeinandsitdown.他请我进来坐下Itisquitenecessaryforustoreadmoreandhavemorepractice.我们多读一些,多做些练习是非常必要的注意前后两个不定式对比意味很强时,不定式符号to是不可以省去的如Thepurposeofnewtechnologiesistomakelifeeasier,nottomakeitmoredifficult.新技术的目的是为了让生活更舒适而不是使生活更艰难2.在likewouldlike,lovewouldlove,hope,hate,need,try,want,wish,plan,mean等动词后,usedto,begoingto结构后,以及beglad,bewilling,behappy等词语后,不定式内容根据上下文内容可以省略,但需要保留不定式符号to,代替整个不定式内容—Wouldyouliketogotothecinema你愿意去看电影吗—I’dloveto.我愿意—HaveyouvisitedMrSmithinhospital你去医院看过史密斯先生吗—Notyet,butImgoingto.还没有,不过我正准备去看望他3.在介词but,except,besides,than,save等表示“除了……”之意的词前,若有实义动词do时,常用无to的不定式作其介词的宾语,若无实义动词do,则用带to的动词不定式Hewasnotabletodoanythingbut/exceptwait.除了等待他什么也做不了Hehadnochoicebuttogivein.除了让步他别无选择4.在下列固定词组或短语之后要跟不带to的不定式hadbetter.../hadbest...最好……wouldrather...than.../would...ratherthan...宁愿……也不……cannothelpbut.../cannotbut.../canbut.../cannotchoosebut...不得不,只得may/mightaswell不妨,还是……的好It’sraininghard.Icannothelpbutstayathome.天在下大雨,我只好留在家里考点四评论性动词不定式有些不定式常用来表示说话人对所谈的内容所持的态度和看法,即对句子内容的评论,故称为评论性动词不定式,也称独立不定式Tobehonest,Idon’tlikethecolourofthiscoat.说实话,我不喜欢这件外套的颜色Totellyouthetruth,sheisnottherightpersonforthejob.对你说实话,她不是干这工作的合适人选考点五动词不定式的主动形式表示被动意义1.不定式作定语与被修饰名词构成动宾关系,并且不定式的逻辑主语就是句子的主语如Ihavetwoletterstoanswer.我有两封信要回2.有些结构中,不定式表达被动意义,却用主动形式,因为可以在句子中找到不定式这个动作的发出者如Givehersomebookstoread.给她一些书看Wouldyoubringmeabenchtositon你能给我拿个凳子坐吗3.某些动词的不定式与be连用时,常见的有toblame,torent等如Thehouseistorent.房子要出租Heistoblamefornotdrivingcarefully.他粗心驾驶应受到责备动名词考点一动名词的基本形式动名词主动被动一般式doingbeingdone完成式havingdonehavingbeendone1.动名词的一般式Shedreamsofbeingalawyer.她梦想成为一名律师2.动名词的完成式完成式表示的动作发生在谓语动词表示的动作之前如Hewaspraisedforhavingdoneagooddeed.他因做了好事而受到表扬3.动名词的被动式HeremembersbeingtakentoBeijingattheageoften.他记得10岁时被带到北京Theyattendedthemeetingwithoutbeinginvited.他们没有受到邀请就去参加了会议4.动名词的完成被动式Wewereallexcitedforhavingbeenpraised.我们因为受到了表扬而很兴奋5.动名词的否定式动名词的否定结构由not+动名词组成如Youhavenoexcusefornotgoing.你没有理由不去Hewaspunishedfornothavingdonehishomework.他因为没做完作业而受到惩罚考点二动名词的基本用法动名词在句子中起名词的作用1.作主语动名词常被看作单数不可数名词它作主语时,谓语动词要用单数第三人称形式ReadingisimportantinlearningEnglish.学英语,阅读是很重要.动名词作主语时,与动词不定式作主语相似,常可用形式主语it,而把真正主语即动名词短语移到句末如Itisreallytiringworkinglatelikethis.工作到这么晚真是累死人2.作表语Hishobbyiscollectingstamps.他爱好集邮3.作宾语动名词除可作动词宾语外,还可以作介词宾语Pleasestopwriting.请不要写了Ilookforwardtoseeinghimagain.我盼望再次见到他1能带动名词作宾语的动词有advise建议consider考虑admit承认appreciate感谢mind介意suggest建议avoid避免delay推迟imagine想象enjoy喜欢practise练习escape逃避allow允许permit允许forbid禁止miss错过2由“动词+介词”构成的短语,其后可跟动名词作宾语如be/getusedto习惯于lookforwardto期望feellike想要succeedin成功insiston坚持getdownto开始认真做某事devote...to...把……献于……setabout开始putoff推迟giveup放弃4.作定语动名词可置于名词前作定语,表示被修饰的名词的用途和性能awaitingroom候车诊室awashingmachine洗衣机ahidingplace藏身处考点三动名词的复合结构由形容词性的物主代词或名词所有格加动名词构成动名词的复合结构,在句子中可作主语、宾语、表语等如Doyoumindmy/mesmokinghere我在这儿抽支烟可以吗Iinsistedonmyhusband/husband’spayingthebill.我坚持要我丈夫付账1在口语和非正式英语中,这种结构如不用在句首,常用人称代词宾格代替物主代词,用名词普通格代替所有格如Therearemanyreasonsforanimalsdyingout.动物的灭绝有很多原因Themother’sworryishersonmakingtroubleforthefamily.这位母亲担心的是她儿子给家里惹麻烦2如果动名词的复合结构在句首,就必须用形容词性的物主代词或名词所有格如Hissmokingcausedthefireintheforest.他抽烟引起了这场森林火灾Marysinglatemadeherteacherangry.玛丽的迟到使她的老师很生气3therebe的动名词的复合结构为therebeing如Whist’thechanceoftherebeingaraintomorrow明天下雨的可能性有多大
(4)动名词可用于简略语中,与no连用,表示禁止,相当于句子省略了谓语如NoSmoking!禁止吸烟!NoParking!禁止停车!NoSpitting!禁止随地吐痰!考点一动词不定式与动名词作主语的区别1.动名词作主语与不定式作主语的区别1在很多情况下动名词作主语与不定式作主语没有明显的不同Seeingisbelieving/Toseeistobelieve.眼见为实2不定式可以表示某一次具体的、特定的或有待实现的动作,而动名词则表示通常的情况如Tomakefulluseofthewastewethrowawayeverydayisagoodidea.充分利用我们每天丢掉的废物是个好主意Paintingisanart.绘画是一门艺术考点二动词不定式与动名词作宾语的区别1.在某些动词之后既可以跟动名词又可以跟不定式作其宾语,两种形式在意义上差别不大,如begin,start,intend,attempt,continue,omit,cease,mence,like,love,hate等Hestartedcryingtocry.他哭了起来Priceswillcontinuerisingtorise.物价将继续上涨1like,love,hate,prefer及dream等词,其后跟不定式和动名词含义差别不大,但略有不同用不定式作宾语时,表示特定的、有待于做的动作;用动名词作宾语时,则表示一般的行为或一个经常性的习惯性的动作Ilikeswimming,butIdon’tliketoswimtoday.我喜欢游泳,但我今天不想游泳2在wouldlike,wouldlove,wouldprefer等后面,通常要用动词不定式Iwouldlovetoseeyoueveryday.我很想天天见到你2.有些动词后跟动名词与后跟不定式意义差别较大,最常见的有1trytodo努力做某事,企图做某事/trydoing试着/尝试做某事如Ittriedtoflyaway,butonewingwasbroken.它想飞走,但一只翅膀受伤了Hetriedtoprovethathisideawaspractical.他试图证明他的想法是切实可行的2remember/forget/regret之后加todo(表示这件事情尚未发生)doing/havingdone表示这件事情已经发生或完成Doyouremembermeetingmeatapartylastyear你还记得去年在一次聚会上你见过我吗Iregrettotellyouthatyou’vefailedintheexam.我很遗憾地告诉你,你考试没及格3meantodo意欲/打算/想要干……meandoing意味着/意思是……如Ididn’tmeantohurtyou.我本无意伤害你的感情Doingmorningexercisesmeansgettingupearly.做早操意味着早起床4can’thelptodo不能帮忙做……/can’thelpdoing禁不住做……如I’mafraidIcan’thelptorepairthecar.恐怕我不能帮着修理汽车了Hearingthenews,hecouldn’thelplaughing.听到那个消息,他禁不住大笑起来5need,want,require作“需要”讲时,用动名词表示被动意义,也可用不定式的被动式如Thegateneeds/wants/requiresmending.门需要修理=Thegateneeds/wants/requirestobemended.3.下列动词只能用不定式作宾语decide/determine,learn,want,expect/hope/wishrefuse,manage,care,pretendoffer,promise,choose,plan,agree,ask/beg,help下列动词只能用动名词作宾语,consider,suggest/advise,lookforwardto,excuse/pardon;admit,delay/putoff,fancy想象,设想;avoid,miss,keep/keepon,practice;deny,finish,enjoy/appreciate;forbid,imagine,risk;can’thelp,mind,allow/permit,escape
4.get也能当作使役动词,表示“使、让、叫”之意,相当于have,但二者也有所不同havesb.dosth./getsb.todosth.使/让/叫某人去做某事havesth.done=getsth.done使/让某事由别人去做havesb./sth.doing使/让某人/物持续地做某事getsb./sth.doing使某人/物开始行动起来Theteacherhadusread/gotustoreadthetextaloud.老师让我们大声朗读课文You’dbetterhave/getyourhaircut.你最好把头发理一下Hemanagedtogetthehorserunning.他努力让马跑了起来巩固练习
1.AIDSissaid____thebiggesthealthchallengetobothmenandwomeninthatareaoverthepastfewyears.A.thatitisB.tobeC.thathasbeenD.tohavebeen
2.—WhereisSmithHesaidhewouldmeetushereatthreeo’clock—Heseems____withMr.Brownintheoffice.A.totalkB.talkingC.tobetalkingB.tohavetalked
3.Theplan____forthetripnextweekisveryimportant.A.madeB.tobemadeC.makingD.hasbeenmade
4.Yoursisterissaid____inthesupermarketwhenshewasdoingshoppingyesterday.A.tobetreatedbadlyB.tohavebeentreatedbadlyC.beingbadlytreatedD.treatingbadly
5.Theteacheraskedus____somuchnoise.A.don’tmakeB.notmakeC.notmakingD.nottomake
6.Itissillyofme____alleggsinonebasket.ThatwastheworstmistakeI’veevermade.A.toputB.tohaveputC.puttingD.havingput
7.Myjobwastowashbottles,whichwouldthenbefilledwithwine,or____thefilledbottlesinboxes.A.toputB.puttingC.havingputD.beingput
8.Todaywehavechatrooms,textmessaging,emailing...butweseem______theartofmunicatingfacetoface.A.losingB.tobelosingC.tobelostD.havinglost
9.Hefeltitagreathonour____tovisitmewhenIwasinhiscity.A.tohavebeentakenB.tohavetakenC.havingtakenD.beingtaken
10.Theyknewherverywell.Theyhadseenher____upfromchildhood.A.growB.grewC.growingD.togrow
11.—WhydidyousellthisoldTVatsuchalowprice—IdiditonlybecauseIwasmade____so.A.doB.todoC.doingD.todoing12.—Excusemesir,whereisRoom301—Justaminute.I’llhaveBob____youtoyourroom.A.showB.showsC.toshowD.showing
13.Mr.Brown,whomIcouldn’tget____myoffer,alwayslikeddoingthingsonhisown.A.toacceptB.acceptC.acceptingD.accepted
14.Willyoubeabletoattendthelecture____nextweekA.givingB.givenC.tobegivenD.beinggiven
15.____thiscake,you’llneed2eggs,175gsugarand175gflour.A.HavingmadeB.MakeC.TomakeD.Making
16.Helenhadtoshout____abovethesoundofthemusic.A.makingherselfhearB.tomakeherselfhearC.makingherselfheardD.tomakeherselfheard
17.Thenewreportershurriedtotheairport,only____thefilmstarhadleft.A.totellB.tobetoldC.tellingD.told
18.Itwasunbelievablethatthefanswaitedoutsidethegymforthreehoursjust____alookatthesportsstars.A.hadB.havingC.tohaveDhave
19.—Youshouldhavethankedherbeforesheleft.—Imeant____,butwhenIwasleavingIcouldn’tfindheranywhere.A.todoB.toC.doingD.doingso
20.Sandycoulddonothingbut____tohisteacherthathewaswrong.A.admitB.admittedC.admittingD.toadmit
21.Ratherthan____onacrowdedbus,healwaysprefers____abicycle.A.ride;fideB.riding;rideC.ride;torideD.toride;riding
22.Ifyouareplanningtospendyourmoneyhavingfunthisweek,better____it—you’vegotsomebigbillsing.A.forgetB.forgotC.forgettingD.toforget
23.I’dratherhavearoomofmyown,howeversmallitis,than____aroomwithsomeoneelse.A.shareB.toshareC.sharingD.tohaveshared24.—Iusuallygotherebytrain.—Whynot____byboatforachangeA.totrygoingB.tryingtogoC.totryandgoD.trygoing25.I’veworkedwithchildrenbefore,soIknowwhat____inmynewjob.A.expectedB.toexpectC.tobeexpectingD.expects
26.Havingfinishedherprojectshewasinvitedbytheschooltothenewstudents.A.speakingB.havingspokenC.tospeakD.tohavespoken
27.Ilikegettingupveryearlyinsummer.Themorningairissogood____.A.tobebreathedB.tobreatheC.breathingD.beingbreathed
28.Whenthecustomercaughttheshopowner______himshestopped______thingsthereandstarteddealingwithanothershop.A.cheating;tobuyB.tocheat;buyingC.cheating;buyingD.tocheat;tobuy
29.Itisdifficulttoimaginehis____thedecisionwithoutanyconsideration.A.acceptB.acceptingC.toacceptD.accepted
30.Whatworriedtheboymostwas____tovisithisfatherinthehospital.A.hisnotallowingB.hisnotbeingallowedC.havingnotbeenallowedD.hisbeingnotallowed
31.Victorapologizedfor____toinformmeofthechangeintheplan.A.hisbeingnotableB.himnottobeableC.hisnotbeingableD.himtobenotable
32.It’snecessarytobepreparedforajobinterview.____theanswersreadywillbeofgreathelp.A.TohavehadB.HavinghadC.HaveD.Having33.Ireallyappreciate____torelaxwithyouonthisniceisland.A.tohavehadtimeB.havingtimeC.tohavetimeD.tohavingtime
34.Mr.Reedmakeuphismindtodevoteallhehadto____someschoolsforpoorchildren.A.setupB.settingupC.havesetupD.havingsetup35Isn’tittimeyougotdownto____thepapersA.markB.bemarkedC.beingmarkedD.marking36Theoldmaniswalkinghardagainstwindswitha____stickinhishand.Let’shelphim.A.walkB.walkedC.walkingD.walker37____themeetinghimselfgavethemagreatdealofencouragement.A.ThepresidentwillattendB.ThepresidenttoattendC.ThepresidentattendedD.Thepresident’sattending38Thediscoveryofnewevidenceledto____.A.thethiefhavingcaughtB.catchthethiefC.thethiefbeingcaughtD.thethieftobecaught39—Henrydoesn’tseemlikethesameperson.—____somuchinthewarhasmadehimmorethoughtful.A.ForhimtoseeB.HisseeingC.HavingseenD.Tohaveseen
40.Wevehadagoodstartbutnextmoreworkneeds____toachievethefinalsuccess.A.beingdoneB.doC.tobedoneD.todo
41.We’rehavingameetinginhalfanhour.Thedecision______atthemeetingwillbeimportantforus..A.tobemadeB.beingmadeC.madeD.havingbeenmade
42.Thismachineisveryeasy.Anybodycanlearntouseitinafewminutes.A.operatingB.tobeoperatingC.operatedD.tooperate
43.Tomtookataxitotheairportonly_____hisplanehighupinthesky.A.findingB.tofindC.beingfoundD.tohavefound44Ilookedupandnoticedasnake______itswayupthetreetocatchitsbreakfast.A.towindB.windC.windingD.wound
45.Beforedrivingintothecityyouarerequiredtogetyourcar____.A.washedB.washC.washingD.towash
46.Ifhetakesonthisworkhewillhavenochoicebut______anevengreaterchallenge.A.meetsB.meetingC.meetD.tomeet
47.Onelearnsalanguagebymakingmistakesand______them.A.correctsB.correctC.tocorrectD.correcting
48.Theoldmansatinfrontofthetelevisioneveryeveninghappy_____anythingthathappenedtobeon.A.towatchB.watchingC.watchedD.tohavewatched49Hegotuplateandhurriedtohisoffice_________thebreakfastuntouched.A.leftB.toleaveC.leavingD.havingleft
50.ChinarecentlytighteneditswaterscontrolsneartheHuangyanIslandtopreventChinesefishingboatsfrom____________intheSouthChinaSea.A.attackingB.havingattackedC.beingattackedD.havingbeenattacked
51.IthinkTomastheheadofabigdepartmentshouldcitherstudyregularlyor______hisjob.A.quitsB.toquitC.quittingD.quit
52.Nomatterhowbrightatalkeryouaretherearetimeswhenitsbettersilent.A.remainB.beremainingC.havingremainedD.toremain
53.Pricesbegantoclimbnoticeablylastyear,___________ahistoricalhighinNovember.A.hitB.tohitC.hittingD.beinghit
54.______thehousingpriceseveralmeasureshavebeenadoptedinthelasttwoyears.A.LoweringB.HavingloweredC.TolowerD.Tohavelowered55.Iwishthattheelderlywouldliveinfortwithoutworryorhealthproblemsintheyearstheyhave.A.leftB.leavingC.toleaveD.beingleft
56.Iappreciatedtheopportunitytostudyabroadtwoyearsago.A.tohavegivenB.tohavebeengivenC.havinggivenD.havingbeengiven
57.---Whomdidyou________thewall---Jack.There________massesofthingsforhimtodobuthemanagedtofinishtheworkasrequired.A.havepainted;wasB.havepaint;wereC.havetopaint;wereD.havepaint;was
58.Asworkersandascitizensweneedtobeabletothinkbeyondourownself-interestand_________whatisrightunderthecircumstances.A.doingB.todoC.havedoneD.done
59.Maryhadtogotoameeting,sosheleftherchildren_________athome.A.playingB.playedC.toplayD.havingplayed
60.AsthelightturnedgreenIstoodforamomentnot_________andaskedmyselfwhatIwasgoingtodo.A.movedBmovingC.tomoveD.beingmoved
61.---Youmaymakemoremistakesifyourpaperisleft_______.---Thanksalot.AndwouldyougivemesomeadviceonhowtopolishitA.beinguncheckedB.tobeuncheckedC.tocheckD.unchecked。