人教版英语非谓语动词完整归纳含答案解析百度文库
人教版中考英语非谓语动词练习题及答案及解析

人教版中考英语非谓语动词练习题及答案及解析一、选择题1.— I decide ___________ hard on my English.—You need to speak as much as possible.A.working B.worked C.to work D.work2.The music ________ by Mozart is well known ________ people all over the world. A.writes; as B.written; for C.written; as D.written; to 3.Sally practices _________ the guitar very hard for the coming contest next month.A.play B.plays C.playing D.to play 4.Nowadays, teachers ought to consider ________ more time on teaching research.A.spend B.to spend C.spending D.spent5.Boys and girls, attention, please! We are not allowed ________ photos here.A.taking B.to take C.take D.taken6.Dad always tells me not ________ just for tests. Or, I’ll lose interest in learning.A.study B.studies C.studying D.to study 7.Spending the holiday in nearby places has become a trend this year as local governments encourage people ________ too far.A.travelling B.not travelling C.travel D.not to travel 8.Who are you going to have ________ the library since the designer is busy these days.A.to design B.designed C.designing D.design9.The way we thought of ________ the environment proved to be very useful.A.to protect B.protecting C.protected D.protects10.The workers are made ________ ten hours a day.A.work B.to work C.working D.worked11.The sadness over her father's death made it difficult for her ________ schoolwork. A.finish B.to finish C.finishing D.to finishing 12.— Do you prefer _______ basketball with me?— No, I'd rather _______ at home and watch TV because of my aching feet.A.play; stay B.to play; to stay C.play; to stay D.to play; stay 13.Our teacher always chooses classical songs she enjoys ________ us between classes. A.relax B.relaxing C.to relax D.to relaxing 14.Our monitor suggested _________ an outing after the mid-term exam.A.organize B.to organize C.organized D.organizing 15.My mother always teaches me how ________ water in my daily life. That really helps me develop a good habit of using water.A.to save B.saving C.saves D.saved16.Dear friends, ________ your best and relaxing yourselves are two helpful ways to get a high grade in this exam. Wish you success.A.try B.trying C.to try D.tries17.—I feel stressed at times, but I don’t know________about it.—You can come to mewhenever you need.A.whom to talk B.when to talk C.who to talk to D.when to talk to 18.Huawei has succeeded in ________new software for his products. I can’t wait ________a new Huawei mobile.A.developing, to buy B.developed, buying C.developing, buy D.develop, buying 19.I prefer ______ the cheaper one of the two sweaters _____ some money for a dictionary. A.to have ; to saving B.having ; to savingC.to have ; to save D.having , to save20.Fans all over the country are talking about ________ this football team has never won any match and ________ to do with it.A.whether; how B.why; how C.whether; what D.why; what 21.How lucky Peter was! Some policemen arrived in time and __________ him out. A.managed to help B.tried to help C.succeeded to help D.tried helping 22.(2017届山东省滨州市滨城区九年级第二次模拟)David enjoys ____ music at weekends, but I prefer ________ for a picnic.A.listening to;go out B.listening to;to go outC.to listen to;to go out D.listen to;going out23.My uncle made up his mind to devote his life pollution happily.A.to prevent; to live B.to prevent; from livingC.to preventing; to live D.to preventing; from living24.—Look at the sign! You aren’t allowed _______ in public places.—Sorry, I didn’t see it.A.smoke B.smoking C.to smoke D.smoked25.一Have you got the tickets for the concert?一Not yet,I didn't realize difficult it was the tickets.A.what; to get B.what; getting C.how; to get D.how; getting26.___________for his good skill, this doctor has a lot of visitors calling for help all the time. A.Knowing B.To know C.Known D.To have known 27.What ______ great fun we had ______ the film Jungle Book.A.a; to watch B./; watching C.a ; watch D./; to watching28.— Listen! Can you hear something?— Yeah, it could be some children outside.A.were playing B.playingC.to play D.play29.Mrs. White showed her students some old maps ________ from the library.A.to borrow B.to be borrowed C.borrowed D.borrowing 30.—Why do the students need to read every day?—________information for writing.A.To collect B.Collecting C.Collect D.Collected 31.—Do you have any plans for the holiday?—Yes, I’m planning to travel to Jiuzhaigou. I’m looking forward to ________ the colourful lakes and amazing waterfalls.A.see B.seeing C.sees D.saw32.With a lot of students about too much homework, our teachers have tried some ways to solve this problem.A.complain B.complaining C.complained D.to complain 33.---Is Jack in the next room ?---It’s hard to say. But I heard him _____ loudly when I passed by just now.A.speak B.to speak C.spoken D.speaking 34.—What are you talking about?—Some pictures ________ yesterday.A.were taken B.took C.taken D.have been taken 35.When I got back home I saw a note on the door ____ “Sorry to miss you; will call later.”A.say B.says C.to say D.saying36.The tiger mom went out the bedroom, her daughter crying sadly.A.left B.leaving C.leaves D.has left37.Lily’s parents always encourage her ____out her opinions.A.speak B.speaking C.to speak D.spoken 38.Your hair is too long. You’d better _____.A.have it cut B.have cut it C.be cutting it D.to cut it39.My computer doesn’t work. I decide to have it ______.A.repair B.repaired C.to repair D.repairing 40.We middle school students are advised _________ at least one hour _________ exercise every day to stay healthy.A.spending; to take B.spending; taking C.to spend; to take D.to spend; taking 41.People are advised to avoid ________ their eyes, nose, and mouth with unwashed hands. A.touch B.touched C.to touch D.touching 42.—At weekends, my parents often go cycling with me around the Fishmouth Wetland Park.—That's great! But my parents are too busy ________ operations to spare me any time.A.to do B.done C.doing D.do43.—Is there anything amazing in today’s newspaper?—Yes. By using ordinary computers, NASA scientists are busy________ at home to control a space rover(天体登陆车)on the Red Planet. .A.to programme B.programming C.programme D.with programming 44.Your English will be better if you practice _______ English for an hour every day. A.speak B.speaking C.to speak D.to speaking 45.Huawei has succeeded in ________new software for his products. I can’t wait ________a new Huawei mobile.A.developing, to buy B.developed, buying C.developing, buy D.develop, buying 46.—What makes you so brave to volunteer in the community?—Because I know that there must be so many people __________ for our support.A.to wait B.wait C.waiting D.waited47.一Waiter! I'd like some beef and a vegetable salad.一Sorry,madam. They only for lunch. Why not consider something else? A.served; to order B.served; orderingC.are served; ordering D.are served; to order48._____ a GPS will make _____ easier for you to visit a strange place.A.Take; it B.To take; that C.Taking; it D.Take; that49.----What do you remember about Grade 7 ?----I remember ______ a prize .A.to win B.winning C.win D.wining50.We should encourage our students _____ hard instead of ____ too much time playing games. A.work; spend B.to work; spendC.work; spending D.to work; spending51.My mother often asks me to do some on Sunday.A.washing B.wash C.to wash D.washed52.The book written by Mo Yan is worth ______ a second time.A.to read B.to be read C.reading D.being read53.---It is selfless ______ the doctor to devote all the time he had ________ for the patients.--I think so, they are so great.A.for; to care B.of; to care C.of; to caring D.for; to caring54.--- Have you seen the movie《Lost in Thailand》?--- Yeah, it’s truly worth ________. It’s ________interesting that I’ve seen it twice. A.seeing; too B.to see; enough C.seeing; so D.to see; such55.Tina is showing off her new phone. She won't stop ________about it.A.talk B.to talk C.talks D.talking56.________ more trees can help to protect the Earth and make it more beautiful. A.Planted B.Plants C.Plant D.Planting57.My father often ________ 15 minutes ________ newspaper every night.A.spend;read B.spend; reading C.spends;reads D.spends; reading 58.—Li Dan, the first Chinese science fiction movie The Wandering Earth is well worth________ . You must go and see it.—OK. I’m going to take my daughter to watch it.A.to be watched B.being watched C.to watch D.watching59.________ fun my family had ________ a vacation in Sanya last summer vacation! A.How, taking B.What, taken C.What, taking D.How, taken 60.David practices________ the piano hard and often gives wonderful performances.A.play B.played C.playing D.to play【参考答案】一、选择题1.C解析:C【详解】句意:——我决定努力学习英语。
高考英语非谓语动词试题(有答案和解析)及解析

高考英语非谓语动词试题(有答案和解析)及解析一、单项选择非谓语动词1.When Peter speaks in public, he always has trouble _ the right things to say. A.thinking of B.to think of C.thought of D.think of【答案】A【解析】【详解】考查非谓语动词。
句意:当Peter在公众场合说话的时候,他总是很难想到合适的说话的内容。
have trouble(in) doing sth 做某事有困难。
故选A项。
2.I had been betrayed by those who I trusted several times, ______ in a suspicious attitude towards everything and everyone.A.resulted B.having resulted C.resulting D.to result【答案】C【解析】【详解】考查非谓语做结果状语。
句意:我曾被我信任的人背叛过几次,导致我对每件事和每一个人都抱着怀疑的态度。
“result in...”为固定搭配,意为“导致”。
前一句“我曾被我信任的人背叛过几次”,导致后面的结果“我对每件事和每一个人都抱着怀疑的态度”。
前一句导致后面的结果,此处要用动词的ing形式作结果状语,因此选C。
3.114.––My car is making a really strange noise.––You’d better get it ______ before you drive to Denver.A.looking at B.looked atC.to look at D.being looked at【答案】B【解析】考查非谓语动词。
句意:——我的汽车发出奇怪的噪音。
——你最好在开车去丹佛之前让人检查一下。
【英语】英语非谓语动词练习题含答案及解析

【英语】英语非谓语动词练习题含答案及解析一、非谓语动词1.I look forward _____ you soon.A. seeB. seeingC. to seeD. to seeing【答案】D【解析】【分析】句意:我盼望尽快见到你。
look forward to doing sth盼望做某事,故答案为D。
【点评】考查固定搭配,注意look forward to中的to是介词,后跟动名词。
2.—Jack hasn't taken his piano lessons for a long time.—He is considering _________ his piano course and spending more time on his study.A. to dropB. to throwC. droppingD. throwing【答案】 C【解析】【分析】句意:——Jack很久没有上钢琴课了。
——他在考虑放弃钢琴课,把更多的时间花在学习上。
consider doing sth考虑做某事。
drop放弃;丢掉;throw扔掉。
故选C。
【点评】考查动名词和动词辨析。
3.一What should we take when going birdwatching? 一 We should take a pair of binoculars____________the birds clearly.A. seeB. seeingC. to seeD. sees【答案】C【解析】【分析】句意:一去看鸟应该带什么?一为了看得清楚,我们应该带一副望远镜。
带上望远镜的目的是看得清楚,用带to的不定式作目的状语。
故选C。
4.I think AI (人工智能) in many fields will to help us solve many problems in the future.A. used, be usedB. is used, be usedC. used, useD. is used, use【答案】 A【解析】【分析】句意:我认为被用在许多领域的人工智能在将来将帮助我们解决许多问题。
非谓语动词技巧全解及练习题(含答案)

【初中英语】必备英语非谓语动词技巧全解及练习题(含答案)一、非谓语动词1.People are supposed____________ hands when they meet for the first time in America.A. shakingB. to shakeC. shake【答案】 B【解析】【分析】句意:在美国,人们第一次相见的时候应握手。
A. shaking现在分词形式;B. to shake动词不定式; C. shake动词原形。
Be supposed to do sth应该做某事,为固定用法,故答案选B。
【点评】考查动词不定式,牢记固定搭配。
2.—Jack hasn't taken his piano lessons for a long time.—He is considering _________ his piano course and spending more time on his study.A. to dropB. to throwC. droppingD. throwing【答案】 C【解析】【分析】句意:——Jack很久没有上钢琴课了。
——他在考虑放弃钢琴课,把更多的时间花在学习上。
consider doing sth考虑做某事。
drop放弃;丢掉;throw扔掉。
故选C。
【点评】考查动名词和动词辨析。
3.My brother is a humorous young man. He often tells jokes to make us .A. laughingB. laughC. to laugh【答案】 B【解析】【分析】句意:我哥哥是应该幽默的年轻人,他经常讲笑话让我们笑。
make sb do sth ,使某人做某事,省略to的动词不定式,应该是动词原形,故选B。
【点评】考查省略to的动词不定式。
make sb do sth ,使某人做某事。
非谓语动词中考真题 含答案解析百度文库

非谓语动词中考真题含答案解析百度文库一、非谓语动词1.The child is crying. Please do something to make him_____.A. stop to cryB. stop cryingC. to stop crying【答案】 B【解析】【分析】句意:孩子在哭,请你想办法让他不要哭.使役动词make后面的宾补要用动词原形,即"make sb.do sth让某人做某事"故排除选项C;stop doing sth停下手头正在做的事情,stop to do sth停下手头的事去做…这里句子应该要表达:宝宝在哭,想办法让宝宝别哭了.所以用stop doing sth.故选B【点评】考查非谓语动词。
2.My friend invited me ______ the Art Club , and I accepted it with pleasure.A. joinB. to joinC. joinedD. joining【答案】 B【解析】【分析】句意:我的朋友邀请我参加艺术俱乐部,我愉快地接受了。
A.动词原形;B.动词不定式;C. 动词过去式;D.动词的ing形式。
invite sb. to do sth.邀请某人做某事。
结合句意及结构,故选B。
3.—Do you have any plans for the holiday?—Yes, I'm planning to travel to Jiuzhaigou. I'm looking forward to the colourful lakesand amazing waterfalls.A. seeB. seeingC. seesD. saw【答案】 B【解析】【分析】句意:——你有度假的计划吗?——是的,我打算去九寨沟旅行。
我期待着看到五颜六色的湖泊和令人惊叹的瀑布。
look forward to+名词/代词/动名词,期盼......,see动词,要用动名词形式seeing,故选B。
人教版英语非谓语动词用法总结含答案解析

人教版英语非谓语动词用法总结含答案解析一、非谓语动词1.Their parents don't allow them _______ in the river because it's really dangerous.A. swimB. swimmingC. to swimD. swam【答案】 C【解析】【分析】句意:他们的父母不允许他们在河里游泳,因为太危险了。
固定搭配allow sb. to do sth.,此处应用不定式。
故选C。
【点评】考查固定搭配allow sb. to do sth.2.My friend invited me ______ the Art Club , and I accepted it with pleasure.A. joinB. to joinC. joinedD. joining【答案】 B【解析】【分析】句意:我的朋友邀请我参加艺术俱乐部,我愉快地接受了。
A.动词原形;B.动词不定式;C. 动词过去式;D.动词的ing形式。
invite sb. to do sth.邀请某人做某事。
结合句意及结构,故选B。
3.I look forward _____ you soon.A. seeB. seeingC. to seeD. to seeing【答案】D【解析】【分析】句意:我盼望尽快见到你。
look forward to doing sth盼望做某事,故答案为D。
【点评】考查固定搭配,注意look forward to中的to是介词,后跟动名词。
4.My little brother didn't go to bed until he finished his homework last night.A. doB. doingC. to do【答案】B【解析】【分析】句意:昨天晚上我弟弟直到完成作业才睡觉。
finish doing sth完成做某事,故答案为B。
英语非谓语动词试题答案及解析

英语非谓语动词试题答案及解析1. Mary ______ all the housework, she dropped herself into the sofa, sighing with relief. A.finished B.had finished C.having finished D.finishing【答案】C【解析】重组分析句子可知,she dropped herself into the sofa是主句,后面是现在分词短语作状语,she前面是逗号,没有连词,故前面用独立主格结构的形式,Mary是逻辑主语。
句意:玛丽完成所有的作业后,她坐在沙发上,叹了一口气。
【考点】考查独立主格结构。
2. The terror attack at a Kunming railway station in southwest China's Yunnan Province, 29 lives and leaving 143 , has brought condemnation from around the world this week. A.claimed; wounding B.claiming; woundedC.claimed; wounded D.claim; wound【答案】B【解析】第一空与后面的leaving是并列的,所以形式一致,第二空作宾语补足语,对“143人”进行补充说明,而wound为及物动词,故用过去分词;所以选B。
【考点】考查非谓语动词作状语和宾语补足语3. _____ in a poor family made Tom very dilligent when he was still young.A.Brought up B.Bringing up C.Having broughtupD.Being brought up【答案】D【解析】句意是:在贫穷家庭里被抚养长大使汤姆年轻的时候就成为很勤奋的人。
英语非谓语动词试题(有答案和解析)

英语非谓语动词试题(有答案和解析)一、非谓语动词1.Nowadays,most people prefer to________ computer games rather than ___________ books.A. play;readingB. play;readC. playing; reading【答案】 B【解析】【分析】句意:现在,大部分人比起读书更喜欢玩电脑游戏。
prefer to doA rather than do B比起B更喜欢做A。
故答案为B。
【点评】考查动词prefer的用法,掌握固定搭配。
2.I like the TV program The Reader best. I think we should spend as much time as we can inour spare time.A. readB. to readC. readingD. reads【答案】 B【解析】【分析】句意:我最喜欢电视节目《朗读者》。
我认为在业余时间,我们应该尽可能多的花费时间读书。
读书是花费时间的目的,在句中做状语,应使用动词不定式,spend time doing sth,表示花钱或时间做了某事,强调做了,根据should,可知事情还没做,因此不能选C,故答案是B。
【点评】考查非谓语动词——动词不定式,注意做目的状语一般应使用动词不定式,同时注意不要受到spend…doing固定搭配的影响。
3.—Jack hasn't taken his piano lessons for a long time.—He is considering _________ his piano course and spending more time on his study.A. to dropB. to throwC. droppingD. throwing【答案】 C【解析】【分析】句意:——Jack很久没有上钢琴课了。
- 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。
人教版英语非谓语动词完整归纳含答案解析百度文库一、非谓语动词1.—Mario, your mobile phone is ringing.—Wait a minute. It's dangerous for us ______ it while crossing the street.A. answeringB. to answerC. answerD. answered【答案】 B【解析】【分析】句意:马里奥,你的手机响了。
--等一下。
在穿过马路时接电话是危险的。
A. answering 动名词或者现在分词;B. to answer 动词不定式; C. answer 动词原形; D. answered动词过去式。
在it is +形容词for sb to do sth,句式中it代替动词不定式做形式主语,结合句意,故选B。
【点评】考查固定的句型it's+adj +for sb to do sth。
2.—I think the environment is terrible these years.—Yes, it will be even worse the government takes action it.A. until; protectB. unless; to protectC. if; protecting【答案】 B【解析】【分析】句意:——我认为这几年来环境太糟糕了。
——是的,环境会变得更糟糕,除非政府采取措施保护环境。
A. until; 直到…为止,B. unless除非,如果不,连词;C. if 如果,连词;until和if放在这里,句意不通顺,take action to do sth. 采取行动去做某事,动词不定式作目的状语,故选B。
【点评】此题考查连词短语和固定搭配。
3.Would you mind ____________down the music? It's too noisy.A. to turnB. turningC. turn【答案】 B【解析】【分析】句意:你介意把音乐的音量调小一些吗?太吵了。
A. to turn 不定式 B. turning 动名词(或现在分词) C. turn.动词原形。
mind.意为"介意;在乎"后面只能跟动名词作宾语,故答案选B。
【点评】考查动名词的用法,掌握固定搭配。
4.—You can only keep the books for two weeks, Tom. Remember ____them on time.—I will.A. returnB. returningC. to return【答案】 C【解析】【分析】句意:—这些书你能借两周,汤姆,记住按时归还它们。
—我会的。
remember to do记住去做某事; remember doing记得做过某事。
根据You can only keep the books for two weeks, 可知借了之后要记得去还,记得去做某事要用to do,故选C。
【点评】考查remember的用法。
牢记remember to do和remember doing的不同。
5.—You'd better advise him ______ anything out of the window while driving.—I will. He has to know it's dangerous.A. not throwingB. no throwingC. not to throwD. don't throw【答案】C【解析】【分析】句意:——你最好劝他开车时不要向车窗外乱扔东西。
——我会的。
他必须知道这很危险。
advise,建议、劝告,固定搭配advise sb. not to do sth.劝告某人不要做某事。
故选C。
【点评】考查固定搭配advise sb. not to do sth.。
6.As a volunteer,the girl wants to visit sick kids in the hospital them up.()A. to cheerB. cheerC. cheeringD. cheered【答案】 A【解析】【分析】作为一名志愿者,这个女孩想去看望医院里生病的孩子使他们振作起来.根据句意可知这个女孩想去看望医院里生病的孩子的目的是使他们振作起来,故该空处填入动词不定式作目的状语,故填to cheer,故选A7. Whenever we kids come over, Auntie Susan just stands there and watches us ________ sure we don't break anything.A. makeB. madeC. to makeD. making【答案】 C【解析】【分析】句意:无论什么时候我们这些孩子们来到这里,Susan姨妈只是站在那里,看着我们以确保我们不打破什么东西。
此处是目的状语,故用动词不定式to make。
watch sb do/doing sth看着某人做了/正在做某事,但是make sure的意思是“保证;确保”,在本句中不符合逻辑,故排除AD;watch sth done看着某事被做,也不符合句意,故选C。
【点评】考查动词的非谓语形式。
8.We only planned the play for an hour, but in the end, we stayed for three hours.A. watchB. watchesC. to watchD. watched【答案】 C【解析】【分析】句意:我们计划只玩一个小时,但是最终,我们呆了三个小时。
plan to do sth计划做某事.根据句意可知选C【点评】考查不定式作宾语。
9.It is necessary for us students _____ the listening ability.A. to improveB. improvingC. improveD. improves【答案】A【解析】【分析】句意:对于我们学生来说提高听力能力是有必要的。
it's +形容词+for sb to do sth 做某事对于某人来说怎么样,故答案为A。
【点评】考查不定式。
掌握固定搭配it's +形容词+for sb to do sth。
10.—I'm new here.—Don't worry. I'll do what I can ______ you.A. to helpB. helpC. helpingD. helped【答案】A【解析】【分析】句意:-我新来这儿。
-别担心。
我会做我能做的事情来帮助你的。
What I can作的是句子的宾语。
“我尽可能做”的目的是“帮助你”,作目的状语,用动词不定式形式。
故选A。
【点评】本题考查非谓语动词。
动词不定式做目的状语。
11.We have worked so long. Shall we stop a rest?A. haveB. to havingC. havingD. to have【答案】 D【解析】【分析】考查非谓语动词。
句意:我们已经工作了很长时间。
我们停下来休息休息吗?stop doing sth停止做某事;stop to do sth停下来去做某事。
所以选D。
12.Mr. Zhou is good at cooking and he has decided ______ his own restaurant.A. openB. openedC. to openD. opening【答案】 C【解析】【分析】句意:周先生擅长烹饪,他已经决定开一家自己的餐馆。
搭配:decide to do sth. 决定做某事;故答案为C。
【点评】考查动词不定式,牢记固定搭配。
13.Mount Xiaolei is not far away from here, but it will still take us a few hours there by bike.A. gettingB. to getC. gotD. get【答案】 B【解析】【分析】考查非谓语动词辨析。
句意:小雷山离这儿不远,但是骑车还是要花我们几小时到那儿。
做某事花某人多长时间的结构是:It takes sb. some time to do sth,即:前用it作形式主语,后用带to的不定式作真实的主语。
故选B。
14.We set up this group disabled people like Ben Smith.A. helpB. to helpC. helping【答案】 B【解析】【分析】句意:我们成立这个小组是为了帮助像Ben Smith这样的残疾人。
建立小组是帮助人的目的,此处不定式to help表目的,作目的状语,故选B。
【点评】考查动词不定式做目的状语。
15.— Jane's spoken English is pretty good.— Yeah, she works hard and practices it both in and out of class.A. spokeB. to speakC. speaking【答案】 C【解析】【分析】考查非谓语动词的用法。
句意:--简的口语很好。
--是的,她工作很努力,在课堂上和课外经常练习。
短语practicedoing sth.练习做某事。
故选C。
16.It was raining. My father asked me _______ a raincoat.A. takeB. takesC. tookD. to take【答案】 D【解析】【分析】句意:正下雨。
我父亲要我带上雨衣。
根据关键词 asked me,再结合选项,可判断出此处考查的是 ask sb. to do sth.的用法,故答案选 D。
【点评】考查固定搭配ask sb. to do sth.。
17.Young people are encouraged to work hard ____their own dreams.A. achieveB. achievesC. to achieveD. achieved【答案】 C【解析】【分析】句意:鼓励年轻人努力工作,实现自己的梦想。
根据句意可知their own dreams是workhard的目的,常用动词不定式来表示目的,故选C。