现在完成时练习题(含答案)

现在完成时专练100题及答案第一部分：填空题1.I ________ (live) in this city for five years.2.We ________ (visit) the museum twice this month.3.She ________ (not finish) her homework yet.4.They ________ (already leave) for the airport.5.How long ________ you ________ (study) English?6.The bus ________ (just arrive) at the station.7.By the time we arrived, they ________ (already eat) all the food.8.My sister ________ (not see) that movie before.9.He ________ (travel) to many countries in his life.10.________ you ever ________ (try) sushi before?答案：1.have lived2.have visited3.hasn’t finished4.have already left5.have, studied6.has just arrived7.had already eaten8.hasn’t seen9.has traveled10.Have, tried第二部分：改错题1.I have eat lunch already.2.She has writes a book.3.We have see that movie last night.4.He has been to Paris twice.5.They have visited Japan never.答案：1.I have eaten lunch already.2.She has written a book.3.We have seen that movie last night.4.He has been to Paris twice.5.They have never visited Japan.第三部分：选择题1.I _____ bought a new car.a)justb)alreadyc)yet2.She _____ seen that movie before.a)alreadyb)neverc)just3._____ you finished your homework?a)Haveb)Doc)Are4.They _____ been to this restaurant.a)haveb)hasc)had5.We _____ bought new clothes for the party.a)hasb)havec)had6.He _____ left for work yet.a)alreadyb)notc)just7._____ she ever been to China?a)Haveb)Hasc)Did8.I _____ visited my grandparents last weekend.a)haveb)hasc)had9.We _____ finished our project by next week.a)haveb)hasc)will10.They _____ traveled to Europe before.a)haveb)haven’tc)has答案：a)justa)alreadya)Havea)haveb)haveb)notb)Hasa)havec)willa)have第四部分：连线题1.I have been to Paris.2.She has already finished her work.3.We have lived in this house for ten years.4.They have never seen snow before.5.He has just started a new job.6.You have visited China, haven’t you?7.Have they ever been to Australia?8.Has he ever met the president?9.Have you ever tried sushi?10.We have traveled to many different countries.答案：g)Have you ever tried sushi?e)You have visited China, haven’t you?a)I have been to Paris.j)They have never seen snow before.d)They have lived in this house for ten years.i)She has already finished her work.c)We have traveled to many different countries.h)Have they ever been to Australia?b)Has he ever met the president?f)He has just started a new job.结论通过这个现在完成时的练习题集，我们可以更好地理解和掌握现在完成时的用法。

现在完成时练习题及答案一、选择题1、 I ＿_____ my homework yetA haven't finishedB have finishedC finishedD didn't finish答案：A解析：yet 常用于现在完成时的否定句和疑问句中，现在完成时的构成是“have/has ＋过去分词”，否定形式是“haven't/hasn't ＋过去分词”，A 选项 haven't finished 符合现在完成时的否定形式。

2、 They ＿_____ in this city since 2008、A liveB livedC have livedD are living答案：C解析：“since ＋时间点”是现在完成时的标志，现在完成时的构成是“have/has ＋过去分词”，C 选项 have lived 符合现在完成时的结构。

3、 Have you ever ＿_____ to Beijing?A goneB beenC wentD go答案：B解析：have been to 表示“去过某地（已经回来）”，have gone to 表示“去了某地（还没回来）”，根据句意“你曾经去过北京吗？”，这里表示去过且已经回来，所以用 have been to，B 选项 been 符合。

4、 My father ＿_____ the Party since 1978、A joinedB has joinedC was inD has been in答案：D解析：“since ＋时间点”是现在完成时的标志，join 是短暂性动词，不能与时间段连用，要转化为 be in，现在完成时的构成是“have/has ＋过去分词”，D 选项 has been in 符合现在完成时的结构。

5、—How long ＿_____ you ＿_____ here?—For two yearsA have; studiedB did; studyC do; studyD will; study答案：A解析：根据答语“For two years”可知问句要用现在完成时，现在完成时的构成是“have/has ＋过去分词”，A 选项 have; studied 符合现在完成时的结构。

现在完成时练习题及答案1. I ________ (study) English for three years.- 答案: have studied2. She ________ (live) in this city since 2010.- 答案: has lived3. They ________ (travel) to many countries around the world. - 答案: have traveled4. The company ________ (expand) its business to Asia.- 答案: has expanded5. He ________ (not finish) his homework yet.- 答案: hasn't finished6. We ________ (meet) all the project requirements.- 答案: have met7. The children ________ (play) outside for two hours.- 答案: have been playing8. Since you ________ (leave), a lot has changed.- 答案: left9. I ________ (never try) this kind of food before.- 答案: have never tried10. She ________ (write) two novels and is working on the third one.- 答案: has written答案解析- 现在完成时的结构是：have/has + 过去分词。

- 现在完成时可以与表示一段时间的状语连用，如"for + 一段时间"或"since + 过去的时间点/从句"。

现在完成时（1）构成：现在完成时由助动词have + 过去分词构成，助动词have 有人称和数的变化。

第三人称单数用has，其余用have.现在完成时的否定式直接在助动词后面加上not、疑问式是把助动词提到主语之前。

以study 为例，其否定式、疑问式和简单回答形式如下：否定式疑问式I have not (haven’t) studied….Have I studied…?You have not (haven’t) studied….Have you studied…?He has not (hasn’t) studied….Has he studied…?否定疑问式简单回答（肯定/否定）Have I not (Haven’t I) studied…?Yes, you have. No, you haven’t.Have you not (Haven’t you) studied…?Yes, I have. No, I haven’t.Has he not (Hasn’t he) studied…?Yes, he has. No, he hasn’t.（2）用法：1）现在完成时通常表示在说话之前已经完成的动作或存在的状态。

说话人强调的是该动作或状态对现在的结果或影响。

My daughter has just gone out. 我女儿刚出去。

I’m sure we’ve met before. 我肯定我们以前见过面。

She has arrived. 她到了。

2）表示持续到现在的动作或状态，往往和包括现在在内的表示一段时间的状语连用，如recently, already, just, lately, for…, since…,yet等。

如：I haven’t heard from her these days. 这些日子我没有收到她的信。

We haven’t seen you recently. 最近我们没有见到你。

现在完成时练习题及答案现在完成时练习题及答案现在完成时是英语中的一个时态，用来表示过去发生的动作或事件对现在产生的影响或结果。

在使用现在完成时时，我们需要注意动词的变化和时间状语的运用。

下面是一些现在完成时的练习题及答案，帮助大家更好地掌握这个时态。

练习题一：1. I (read) three books this week.2. She (not finish) her homework yet.3. We (visit) the Louvre Museum last year.4. They (already eat) lunch.5. He (not see) the movie before.答案一：1. I have read three books this week.2. She has not finished her homework yet.3. We visited the Louvre Museum last year.4. They have already eaten lunch.5. He has not seen the movie before.练习题二：1. How long (you/learn) English?2. (she/ever/be) to Paris?3. We (not see) each other for a long time.4. They (not start) the project yet.5. (he/do) his homework?答案二：1. How long have you learned English?2. Has she ever been to Paris?3. We have not seen each other for a long time.4. They have not started the project yet.5. Has he done his homework?练习题三：1. He (live) in London since 2010.2. (you/ever/try) sushi?3. We (not visit) the Grand Canyon yet.4. They (already/go) to the beach.5. (she/finish) her work?答案三：1. He has lived in London since 2010.2. Have you ever tried sushi?3. We have not visited the Grand Canyon yet.4. They have already gone to the beach.5. Has she finished her work?练习题四：1. How many times (you/be) to New York?2. (he/ever/see) a ghost?3. We (not start) the meeting yet.4. They (already/visit) the Eiffel Tower.5. (she/arrive) at the airport?答案四：1. How many times have you been to New York?2. Has he ever seen a ghost?3. We have not started the meeting yet.4. They have already visited the Eiffel Tower.5. Has she arrived at the airport?通过以上的练习题，我们可以更好地理解和掌握现在完成时的用法。

现在完成时练习题及答案(精华版)现在完成时练习题及答案(精华版)一. 选择正确的答案填空。

1. I _____________ my homework already.a) didb) have donec) dod) have been doing2. She ____________ to the supermarket and bought some groceries.a) goesb) has gonec) wentd) had gone3. By the time he arrived, the party _______________ .a) is finishingb) has finishedc) has been finishingd) will finish4. Have you ever ____________ to Japan?a) gob) wentc) beend) going5. We ____________ for over two hours.a) have been waitingb) have waitedc) waitedd) were waiting答案：1. b) have done2. b) has gone3. b) has finished4. c) been5. a) have been waiting二. 根据句意，用现在完成时填空。

1. I ____________ my breakfast already. (have)2. She ____________ a new car. (buy)3. They ____________ a great time on vacation. (have)4. He ____________ the movie before. (watch)5. We ____________ each other for many years. (know)答案：1. have had2. has bought3. have had4. has watched5. have known三. 改错题。

现在完成时练习题及答案一、选择题1、 I ＿_____ this book for two weeks I have to return it nowA have borrowedB have keptC have lentD borrowed答案：B解析：borrow，lend 都是短暂性动词，不能与时间段连用，keep 表示“保存，保持”，是延续性动词，可以与时间段连用，for two weeks 是时间段，所以用 have kept。

2、—How long ＿_____ you ＿_____ in this city?—For five yearsA have; livedB did; liveC do; liveD were; living答案：A解析：根据答语 For five years 可知，问句要用现在完成时，结构是“have/has ＋动词的过去分词”，live 的过去分词是 lived，所以选 A。

3、 They ＿_____ since 2012、A have marriedB have been marriedC got marriedD married答案：B解析：marry 是短暂性动词，不能与时间段连用，be married 表示“结婚”的状态，可以与时间段连用，since 2012 是时间段，所以用 have been married。

4、—Have you ever been to Shanghai?—Yes I ＿_____ there last yearA wentB have goneC have beenD go答案：A解析：last year 是过去的时间点，要用一般过去时，go 的过去式是went，所以选 A。

5、—＿_____ you ＿_____ your homework yet?—Yes, I ＿_____ it just nowA Did; do; finishedB Have; done; finishedC Have; done; have finishedD Will; do; finish答案：B解析：yet 常用于现在完成时的疑问句和否定句中，just now 是过去的时间点，要用一般过去时，所以问句用现在完成时，答句用一般过去时，故选 B。

完整版)现在完成时专项练习题及答案(精选)1、Both his XXX.2、He has already been to Shanghai。

has he?3、Have you just met Mr。

Li?4、The famous writer has written one new book in the past two years.5、Our country has changed a lot so far。

Yes。

I hope it will be even better.6、Zhao Lan has already studied in this school for two years.7、We have known Xiao Li since she was a little girl.8、XXX is a very nice film。

I have seen it twice.9、These farmers have been to the United XXX。

When did they go there?10.Have you finished your homework yet。

Yes。

I just finished it a moment ago.11.His father has been a member of the Party since 1978.12.Yes。

we have been friends for ten years.13.How long have you been here。

About two months.14.Hurry up。

The play has been on for ten minutes.15.It has been ten years since he left the army.16.Miss Green isn't in the office。

现在完成时专项练习一、单项选择。

1、Both his parents look sad . Maybe they _________what's happened to him .（呼和浩特）Ａ. knew Ｂ. have knownＣ. must know Ｄ.will know2、He has _______ been to Shanghai , has he ?Ａ. already Ｂ.never Ｃ.ever Ｄ. still3、Have you met Mr Li ______？Ａ. just Ｂ. agoＣ.before Ｄ. a moment ago4、The famous writer _____ one new book in the past two year .Ａ. is writing Ｂ.was writing Ｃ.wrote Ｄ.has written5、—Our country ______ a lot so far .—Yes . I hope it will be even ______ .Ａ. has changed ; wellＢ. changed ; goodＣ. has changed ; better Ｄ. changed ; better6、Zhao Lan ______already ______in this school for two years .Ａ. was ; studying Ｂ. will ; studyＣ. has ; studied Ｄ. are ; studying7、We ______ Xiao Li since she was a little girl .Ａ. know Ｂ. had knownＣ. have known Ｄ. knew8、Harry Potter is a very nicefilm .I_______ it twice .Ａ. will see Ｂ. have seenＣ. saw Ｄ.see9、—These farmers have been to the United States .—Really ? When _____ there ?Ａ. will they go Ｂ. did they goＣ. do they go Ｄ. have they gone10、—______ you ___ your homework yet ?—Yes . I _____ it a moment ago .Ａ. Did ; do ; finished Ｂ. Have ; done ; finishedＣ. Have ; done ; have finished Ｄ. will ; do ; finish11、 His father ______ the Partysince 1978 .Ａ. joined Ｂ. has joinedＣ. was in Ｄ. has been in12、—Do you know him well ?— Sure .We _________ friends since ten years ago .Ａ. were Ｂ. have beenＣ. have become Ｄ. have made13、—How long have you ____ here ?—About two months .Ａ. been Ｂ. gone Ｃ. come Ｄ. arrived14、Hurry up! The play __________ for ten minutes .Ａ. has begun Ｂ. had begunＣ. has been on Ｄ. began15、 It _____ ten years since heleft the army .Ａ. is Ｂ. has Ｃ. will Ｄ. was16、 Miss Green isn't in the office .she_______ to the library .Ａ.has gone Ｂ. wentＣ.will go Ｄ. has been17、My parents ______ Shandong forten years .Ａ. have been inＢ. have been toＣ. have gone toＤ. have been18、The students have cleaned theclassroom, ?A. so theyB. don’t theyC. have theyD. haven’t they19、 has Mr White been a member ofGreener China since he to China?A. How soon, comesB. How often, gotC. How long, cameD. How far, arrived20、 His uncle for more than 9years.A. has come hereB. has started to workC. has lived thereD. has left the university二、句型转换。

现在完成时练习题及答案1. 完成句子，我__________(吃)晚饭了。

答案，我已经吃晚饭了。

2. 完成句子，他们__________(去)那家餐厅了吗？答案，他们已经去那家餐厅了吗？3. 完成句子，她__________(看)过这部电影吗？答案，她已经看过这部电影了吗？4. 完成句子，你__________(听)过这首歌吗？答案，你已经听过这首歌了吗？5. 完成句子，我们__________(做)完作业了。

答案，我们已经做完作业了。

6. 完成句子，他__________(去)过中国吗？答案，他已经去过中国了吗？7. 完成句子，他们__________(结婚)了吗？答案，他们已经结婚了吗？8. 完成句子，你__________(读)完这本书了吗？答案，你已经读完这本书了吗？9. 完成句子，她__________(去)过欧洲吗？答案，她已经去过欧洲了吗？10. 完成句子，我们__________(见)过他的父母。

答案，我们已经见过他的父母。

现在完成时是英语中的一种时态，用来表示过去发生的动作对现在的影响或结果。

它通常由助动词“have/has”加上动词的过去分词构成。

现在完成时常用于以下情况：1. 表示过去发生的动作对现在造成的影响或结果。

2. 表示过去发生的动作在未来会继续产生影响。

3. 表示过去发生的动作对现在的情况有重要意义或影响。

现在完成时的用法相对灵活，但需要根据具体的语境来决定是否使用。

下面我们来看一些练习题及答案，帮助大家更好地掌握现在完成时的用法。

1. 完成句子，我__________(吃)晚饭了。

答案，我已经吃晚饭了。

2. 完成句子，他们__________(去)那家餐厅了吗？答案，他们已经去那家餐厅了吗？3. 完成句子，她__________(看)过这部电影吗？答案，她已经看过这部电影了吗？4. 完成句子，你__________(听)过这首歌吗？答案，你已经听过这首歌了吗？5. 完成句子，我们__________(做)完作业了。

英语现在完成时专项练习题（附答案）现在完成时（一）一、单项选择1. Have you met Mr. Li ___?A. justB.agoC.beforeD. a moment ago2.-----Have you been to Beijing?----No, I ____.A.hasB.haveC.hasn'tD.haven't3.I ____the film already.A.sawB.have seenC.seeD.will see4. Have you ever____to Canada?A.beB.areC.beenD.is5. He ____Water World last year.A.went toB.goes toC.has been toD.has gone to6.---Have you ever been to Sanya?---Yes, I’ve ____been there twice.A.alreadyB.neverC.neitherD.yet7.Tom hasn’t been to Italy____, but he has ___been to America.A.already,yetB.yet,alreadyC.already,alreadyD.yet,yet8.I haven’t seen the film___.A.yetB.everC.alreadyD.just9.----What are you going to do tomorrow?-----I ___yet.A. didn’t decideB.won’t decideC.have decideD.haven’t decided10.----I have never been to Tokyo.-----____.A. So do IB.So have IC. Neither have ID. Neither do I参考答案1-5:CDBCA 6-10:ABADC二、用所给单词的适当形式填空。

现在完成时练习题及答案现在完成时练习题及答案现在完成时是英语中一个重要的时态，用来表示过去发生的动作或事件对现在产生的影响或结果。

在学习和掌握这个时态时，练习题是非常有效的学习方法之一。

下面是一些现在完成时的练习题及答案，希望能够帮助大家更好地理解和掌握这个时态。

练习题一：1. I __________ (finish) my homework already.2. She __________ (not visit) her grandparents for a long time.3. We __________ (live) in this city since 2010.4. They __________ (not see) that movie yet.5. He __________ (just arrive) at the airport.答案一：1. have finished2. has not visited3. have lived4. have not seen5. has just arrived练习题二：1. How long __________ (you/learn) English?2. We __________ (never/try) this restaurant before.3. She __________ (already/read) that book twice.4. __________ (he/ever/be) to Paris?5. They __________ (not see) each other since last year.答案二：1. have you learned2. have never tried3. has already read4. Has he ever been5. have not seen练习题三：1. He __________ (travel) to many countries in the past few years.2. __________ (you/ever/visit) a foreign country?3. They __________ (not finish) their project yet.4. She __________ (not see) her best friend since they graduated.5. We __________ (already/eat) dinner.答案三：1. has traveled2. Have you ever visited3. have not finished4. has not seen5. have already eaten练习题四：1. How many books __________ (you/read) this year?2. I __________ (not see) him for a long time.3. She __________ (already/buy) a new car.4. They __________ (not go) to the beach last summer.5. __________ (he/ever/try) sushi?答案四：1. have you read2. have not seen3. has already bought4. did not go5. Has he ever tried练习题五：1. We __________ (live) here since 2015.2. __________ (you/ever/visit) the Great Wall?3. He __________ (not finish) his work yet.4. She __________ (not see) that movie before.5. How long __________ (they/be) friends?答案五：1. have lived2. Have you ever visited3. has not finished4. has not seen5. have they been通过以上的练习题及答案，我们可以更好地理解和掌握现在完成时的用法。

现在完成时练习题及答案1. I _______ (已经看过) the movie "Inception" twice.2. She _______ (已经学习) English for five years.3. They _______ (已经去过) Paris three times.4. The company _______ (已经发展) a lot since it was founded.5. We _______ (已经决定) to go on a trip next month.答案1. have seen2. has been learning3. have been to4. has developed5. have decided练习题6. He _______ (已经忘记) his password.7. The children _______ (已经长大) so much since we last saw them.8. She _______ (已经开始) a new job last week.9. They _______ (已经完成) their project.10. I _______ (已经收到) an email from my friend.答案6. has forgotten7. have grown9. have completed10. have received练习题11. The weather _______ (已经改变) a lot this year.12. They _______ (已经搬家) to a new city.13. She _______ (已经尝试) a new recipe.14. We _______ (已经等待) for an hour.15. He _______ (已经学会) to play the guitar.答案11. has changed12. have moved13. has tried14. have been waiting15. has learned练习题16. The project _______ (已经推迟) several times.17. She _______ (已经工作) here for ten years.18. They _______ (已经发现) the problem in the system.19. I _______ (已经读) the book you recommended.20. He _______ (已经改变) his mind.答案16. has been delayed18. have discovered19. have read20. has changed这些练习题可以帮助你更好地理解和掌握现在完成时的用法。

现在完成时练习题108道现在完成时用于过去发生的动作或状态与现在的联系，包括对现在的影响、造成的结果以及动作的持续等。

现在完成时的形式是由“have/has + 过去分词”构成。

1.1 现在完成时的构成肯定句：主语+ have/has + 过去分词...否定句：主语+ have/has + not + 过去分词...疑问句：Have/Has + 主语+ 过去分词...?疑问代词/疑问副词+ have/has + 主语+ 过去分词...?I / You have seen it I / You have not seen it Have you seen it? Yes, I have.No, I haven't.He / She / It has seen it He / She / It has not seenitHas he seen it ? Yes, he has.No, he hasn't.We / You / They have seen it. We / You / They havenot seen it.Have they seen it? Yes, they have.No, they haven't.1.2 现在完成时的肯定句句型：主语（第三人称单数以外的人称）+ have主语（第三人称单数）+ has +现在完成时的肯定句由助动词have/has加过去分词构成：He's gone shopping.他去买东西了。

I've never been to Paris.我从未到过巴黎。

1.3 现在完成时的否定句句型：主语+ have/has + not + 过去分词...现在完成时的否定句是在助动词have/has后加not，之后是过去分词：I haven't seen him for a long time.我已经很久没见到他了。

现在完成时练习题及答案一、选择题1. I _______ my homework already.A) have doneB) had doneC) didD) do答案：A2. She _______ her book for two weeks.A) has borrowedB) borrowedC) has been borrowingD) was borrowing答案：C3. They _______ the project since last year.A) have startedB) startedC) have been startingD) were starting答案：A4. The weather _______ a lot since I moved here.A) has changedB) changedC) is changingD) will change答案：A5. I _______ my keys somewhere in the house.A) lostB) have lostC) am losingD) was losing答案：B二、填空题6. I _______ (study) English for three years.答案：have been studying7. She _______ (not see) her family since she moved to another city.答案：hasn't seen8. The company _______ (expand) its business to new markets.答案：has expanded9. He _______ (just finish) his report when I called him.答案：had just finished10. They _______ (live) in this house for five years.答案：have been living三、改错题11. She has went to the store.答案：She has gone to the store.12. They have been started the project last week.答案：They started the project last week.13. I have lost my keys yesterday.答案：I lost my keys yesterday.14. He has been studying for the exam for two hours.答案：He has been studying for the exam for two hours. (No error)15. The children have played outside all day.答案：The children have been playing outside all day.四、翻译题16. 他去过中国三次。

现在完成时练习题108道现在完成时用于过去发生的动作或状态与现在的联系，包括对现在的影响、造成的结果以及动作的持续等。

现在完成时的形式是由“have/has + 过去分词”构成。

1.1 现在完成时的构成肯定句：主语+ have/has + 过去分词...否定句：主语+ have/has + not + 过去分词...疑问句：Have/Has + 主语+ 过去分词...?疑问代词/疑问副词+ have/has + 主语+ 过去分词...?1.2 现在完成时的肯定句句型：主语（第三人称单数以外的人称）+ have主语（第三人称单数）+ has +现在完成时的肯定句由助动词have/has加过去分词构成：He's gone shopping.他去买东西了。

I've never been to Paris.我从未到过巴黎。

1.3 现在完成时的否定句句型：主语+ have/has + not + 过去分词...现在完成时的否定句是在助动词have/has后加not，之后是过去分词：I haven't seen him for a long time.我已经很久没见到他了。

The road hasn't been cleaned since it snowed.自下过雪以后这条路一直没有清扫过。

1.4 现在完成时的一般疑问句句型：Have/Has + 主语+ 过去分词...?回答方式：Yes，主语+ have/has.No，主语+ have/has + not.现在完成时的一般疑问句是将助动词have/has置于主语之前（大写have/has后的第一个字母），在句尾加问号；这种语序是倒装语序：Have you done it? —Yes，I have./No，I haven't.你做这件事了吗? ——是的，我做完了。

/不，我没有。

Have you ever been to India? —Yes，I have./No，I haven't.你去过印度吗? ——是的，我去过。

7．— Would you care for a cup of tea? It tastes pretty good.
— Ione. Thank you just the same.
A．have had B．had C．would have D．will have
【答案】A
【解析】
【详解】
考查时态。句意：——你想喝杯茶吗?味道很好。——我已经喝过了，我仍然谢谢你。结合句意可知此处用现在完成时态，故选A。
He has lived here since he came.自从他来到这里，就一直在这里住着。
2.It is /has been+一段时间+since主语+一般过去时态+其他。自从做某事有多长时间了。
在这个句型中如果从句的动作是终止性动词，则表示从动作开始到现在多长时间了；如果从句的动作是持续性动词，则表示从动作结束到现在多长时间了。It is three years since he joined (终止性动词)the army.他参军有三年了；It is five years since he lived（持续性动词）here.他离开这有五年了。
15．My father ____his little store rapidly into a big department store in the past ten years.
A．have been noticed B．are noticing
C．will notice D．have noticed
【答案】D
【解析】
【详解】
考查现在完成时态。句意：随着智能机器人技术的发展，人们已经注意到机器人之间合作的重要性，以及在实践中的挑战。结合句意可知句子用现在完成时态，people是句子主语，故答案为D。