2021-2022四川中考英语复习课件 第2篇专题9动词的时态(共73张PPT)

(共73张PPT)
第二篇　攻专题 · 能力提升
一　语法专题突破
专题九　动词的时态
栏目导航
透析中考
四川中考真题精练
第 * 页
1．动词的五种基本形式
透 析 中 考
知识精讲
形式 构成 例词
原形 即词典中给出的一般形式 do，hear，keep，teach
第 * 页
形式 构成 例词
第三人称
单数形式 一般在动词原形后加－s enjoy→enjoys
swim→swims
以s、x、o、ch、sh结尾的动词，在词尾加－es go→goes
fix→fixes
pass→passes
teach→teaches
wash→washes
以辅音字母加y 结尾的动词，先将y变为i，再加－es carry→carries
study→studies
第 * 页
形式 构成 例词
现在分词 一般在动词原形后加－ing read→reading
wait→waiting
以不发音的字母e结尾的动词，先去e，再加－ing come→coming
make→making
以重读闭音节结尾且末尾只有一个辅音字母的动词，先双写该辅音字母，再加－ing begin→beginning
stop→stopping
swim→swimming
以ie结尾的动词，先变ie为y，再加－ing die→dying
lie→lying
tie→tying
第 * 页
形式 构成 例词
过去式与
过去分词 一般在动词原形后加－ed look→looked
work→worked
以e结尾的动词，直接加－d live→lived
move→moved
以辅音字母加y结尾的动词，先将y变为i，再加－ed marry→married
study→studied
以重读闭音节结尾且末尾只有一个辅音字母的动词，先双写该辅音字母，再加－ed fit→fitted
plan→planned
stop→stopped
动词不规则变化见课本《不规则动词表》 buy→bought→bought
come→came→come
第 * 页
2．常用时态的构成(以study为例)
名称 构成 形式 例句
一般现在时 (1)动词原形
(2)第三人称单数形式 肯定式 We study English every day.我们每天都学习英语。He studies English every day.他每天都学习英语。
否定式 We don't study English every day.我们并非每天都学习英语。
He doesn't study English every day.他并非每天都学习英语。
第 * 页
名称 构成 形式 例句
一般现在时 (1)动词原形
(2)第三人称单数形式 一般疑问式及回答 —Do you study English every day？你们每天都学习英语吗？
—Yes，we do./No，we don't.是的，我们每天都学。/不，我们并非每天都学。—Does he study English every day？他每天都学习英语吗？—Yes，he does./No，he doesn't.是的，他每天都学。/不，他并非每天都学。
第 * 页
名称 构成 形式 例句
一般过去时 动词
过去式 肯定式 He studied English yesterday.他昨天学习了英语。
否定式 He didn't study English yesterday.他昨天没有学习英语。
一般疑问式及回答 —Did he study English yesterday？他昨天学习英语了吗？—Yes，he did./No，he didn't.是的，他学了。/不，他没学。
第 * 页
名称 构成 形式 例句
现在进行时 am/is/are
＋现在分
词 肯定式 He is studying English now.他现在正在学习英语。We are studying English now.我们现在正在学习英语。
否定式 He isn't studying English now.他现在没有学习英语。We aren't studying English now.我们现在没有学习英语。
一般疑问式及回答 —Is he studying English now？他现在正在学习英语吗？—Yes，he is./No，he isn't.是的，他正在学。/不，他没学。—Are you studying English now？你们现在正在学习英语吗？—Yes，we are./No，we aren't.是的，我们正在学。/不，我们没在学。
第 * 页
名称 构成 形式 例句
过去进行时 was/were
＋现在分词 肯定式 He was studying English then.他那时正在学习英语。We were studying English then.我们那时正在学习英语。
否定式 He wasn't studying English then.他那时没在学习英语。
We weren't studying English then.我们那时没在学习英语。
一般疑问式及回答 —Was he studying English then？他那时正在学习英语吗？—Yes，he was./No，he wasn't.是的，他正在学。/不，他没在学。—Were you studying English then？你们那时正在学习英语吗？—Yes，we were./No，we weren't.是的，我们正在学。/不，我们没在学。
第 * 页
名称 构成 形式 例句
一般将来时 (1)will/shall＋动词原形
(2)am/is/are going to＋动词原形 肯定式 He will study English tomorrow.他明天要学习英语。
He is going to study English tomorrow.他打算明天学习英语。
否定式 He won't study English tomorrow.他明天不会学习英语。He isn't going to study English tomorrow.他明天不打算学习英语。
一般疑问式及回答 —Will he study English tomorrow？他明天会学习英语吗？—Yes，he will./No，he won't.是的，他会。/不，他不会。—Is he going to study English tomorrow？他明天打算学习英语吗？—Yes，he is./No，he isn't.是的，他打算学。/不，他不打算学。
第 * 页
名称 构成 形式 例句
现在完成时 have/has＋
过去分词 肯定式 He has already studied English.他已经学过英语了。We have already studied English.我们已经学过英语了。
否定式 He hasn't studied English yet.他还没有学习英语。We haven't studied English yet.我们还没有学习英语。
一般疑问式及回答 —Has he studied English yet？他学习英语了吗？—Yes，he has./No，he hasn't.是的，他学了。/不，他还没学。—Have you studied English yet？你们学习英语了吗？—Yes，we have./No，we haven't.是的，我们学了。/不，我们还没学。
第 * 页
名称 构成 形式 例句
过去完成时 had＋过去分词 肯定式 He had studied English by then.那时他已经学过英语了。
否定式 He hadn't studied English by then.那时他还没有学习英语。
一般疑问式及回答 —Had he studied English by then？那时他学过英语了吗？—Yes，he had./No，he hadn't.是的，他学过了。/不，他还没学。
第 * 页
3．各种时态常用的时间状语
时态 时间状语
一般
现在时 (1)频度副词：always总是，usually通常……(2)时间状语：every day/year每天/年，on Sunday在星期天……(3)频率次数：once a week一周一次，four times a month一个月四次……
一般
过去时 yesterday昨天，the day before yesterday前天，last night/year昨晚/去年，two days ago两天前，in 2005 在2005年，at that time在那时……
现在
进行时 now 现在，at the moment此刻，at present 目前，these days 这些天……
第 * 页
时态 时间状语
过去
进行时 then那时，at that time那时，at that moment当时，at this time yesterday昨天这个时候……
一般
将来时 tomorrow 明天，soon 不久，next Sunday下个星期天，someday 某天……
现在
完成时 already 已经，just 刚刚，yet 还/尚未，ever 曾经，before 以前，for three days三天，for a long time 很长时间……
过去
完成时 by then到那时，by that time到那时为止，by the end of last year到去年底
第 * 页
4．一般现在时的基本用法
用法 例句
表示现在的状态、能力、性格及特征 I am a middle school student.我是一名中学生。He plays basketball very well.他篮球打得非常好。
表示经常性或习惯性的动作 She usually watches TV on Saturday evening.她通常在周六晚上看电视。They go to school on foot every day.他们每天步行去上学。
表示客观事实或普遍真理 The light travels faster than the sound.光比声音传播得快。Three plus two makes five.3加2等于5。
第 * 页
用法 例句
在时间、条件、让步或方式状语从句中表示将来 He'll ring you up as soon as he gets to Beijing.他一到北京就会给你打电话。We won't go swimming if it rains tomorrow.如果明天下雨的话，我们就不去游泳。Whether you help him or not，he will fail.无论你们是否帮助他，他都会失败。Next time I'll do as he says.下一次我会按照他说的做。
表示计划或安排好的要发生的动作 School begins the day after tomorrow.学校后天开学。The ship starts at ten o'clock in the morning.轮船将于上午10点起航。
第 * 页
巧学妙记
一般现在时的用法口诀：表示动作常发生，特征性格和能力。存在状态和习惯，客观事实与真理。如果主语是三单，谓语就要变一变。句中若把助动词用，谓语动词用原形。
第 * 页
5．一般过去时的基本用法
用法 例句
表示在过去某时间发生的动作或存在的状态 He was a worker three years ago.三年前他是个工人。We built a large library last year.我们去年修建了一座大型图书馆。
表示过去经常或反复发生的动作 When he was young，he went to swim almost every day.他年轻时几乎每天都去游泳。
第 * 页
巧学妙记
一般过去时的用法口诀：一般过去时，表示过去发生事，过去时间作标记，句中动词过去式。否定句很简单，谓语动词前didn't添。疑问句要构成，主语之前did现，还有一点不能忘，后面动词要还原。
第 * 页
6．现在进行时的基本用法
用法 例句
表示现在正在进行或发生的动作 Mary is listening to the teacher.玛丽正在听老师讲课。They are watching TV now.他们现在正在看电视。
表示目前一段时间正在进行的动作 He is writing a novel these days.这些天他在写一部小说。We are studying hard this term.我们这学期学习一直很努力。
表示位移的动词的进行时可表示将来的动作 He is coming to see his uncle tomorrow.他明天要来看他叔叔。They are leaving for London next week.他们下周将动身去伦敦。
第 * 页
巧学妙记
现在进行时的用法口诀：
主语在句首，am、is和are跟着走。现在分词紧跟后，其他成分不可丢。表示动作正进行，句中有now时间定。否定句太简单，be后来把not添。若问疑问句怎么变，只须把am、is和are来提前。
第 * 页
7．过去进行时的基本用法
用法 例句
表示过去某个时刻或某段时间正在进行或发生的动作 She was doing her homework from eight to nine last night.昨晚8点到9点她在做作业。
when与while引导的时间状语从句表示主句的动作与从句的动作同时发生 While we were having a party，the light went out suddenly.当我们正举行聚会时，灯突然灭了。
第 * 页
8．一般将来时的基本用法
用法 例句
表示将来的动作或状态 Mary will be fifteen years old tomorrow.
玛丽明天满15岁。
表示打算、计划、安排或可能将要发生的动作 Look！It is going to snow.瞧！要下雪了。
We're going to have a meeting to discuss the plan.我们打算开会讨论这个计划。
第 * 页
9．现在完成时的基本用法
用法 例句
表示过去发生的动作对现在造成了一定的影响或产生了结果 She has already finished the work.她已经完成了这项工作。
表示过去开始的某个动作延续到现在(用延续性动词) He has lived in America since 1960.从1960年开始他就一直住在美国。We have studied English for six years.我们学习英语已经六年了。
第 * 页
巧学妙记
现在完成时的用法口诀：
完成、持续和经验，六字概括基本全。表完成，just和already常出现；表持续，since和for把成段时间来呈现；表经验，ever和never用在句中间。
第 * 页
10．过去完成时的基本用法
用法 例句
表示在过去某一时间或动作发生以前已经完成的动作 Mr.Wang had taught math for five years before he came here.王老师在来这儿之前已教了五年的数学。
表示从过去某一时刻开始，一直延续到过去另一时刻的动作或状态 He said he had worked there for three years.他说他已在那儿工作三年了。Laoli died yesterday.He had been a good friend of mine.老李昨天去世了。他曾是我的一个好朋友。
第 * 页
1．中考试题里常考查不同时态的辨析，考生应根据时间状语来判断时态。
【例题】(2020·黑龙江绥化)My family ________ for dinner now. We're busy.
A．is preparing　　 B．are preparing
C．prepares
方法指导
第 * 页
【答案】B
【解析】句意：我的家人现在正在________晚餐。我们很忙。根据时间状语now可知，句子用现在进行时，排除C。根据语境和第二句中的we可知，主语表示家庭成员，是复数含义，所以be动词用are。故选B。
第 * 页
【跟进训练1】(2020·北京)—What's that noise, Sam
—My little brother _______ with his toy car now.
A．will play　　 B．is playing
C．plays　　 D．played
B　
第 * 页
2．如果题中没有明确的时间标志时，考生需要根据上下文的语境推测出动作发生的时间点，然后确定句子的时态。
【例题】(2019 ·浙江温州)—Linda, Dad has finished his work and we________ to the gym to pick you up.
—Thank you, Mom.
A．drive　　 B．drove
C．have driven　　 D．are driving
第 * 页
【答案】D
【解析】句意：“琳达，爸爸已经完成他的工作了，我们________到体育馆来接你。”“谢谢你，妈妈。”分析句意并结合语境可知用现在进行时态表将来。故选D。
第 * 页
【跟进训练2】(2018·重庆B卷)Listen! Mr.Black _______ a talk on robots in the hall.
A．gives　　 B．is giving
C．will gave　　 D．gave
B　
第 * 页
3．在时间状语从句中，考生可根据主从句中谓语动词的一致性来确定时态，或根据上下文语境来确定时态。
【例题】(重庆A卷)Don't worry.Bill will help you look after your dog when you ________ away on business.
A．are　　 B．were
C．will be　　 D．have been
第 * 页
【答案】A
【解析】本句是含when引导的时间状语从句的复合句。根据“主将从现”的原则，即主句为一般将来时，时间状语从句要用一般现在时可确定选A。
第 * 页
【跟进训练3】(2019·甘肃兰州)Peter with his classmates ______ for the bus when the earthquake happened.
A．is waiting　　 B．was waiting
C．are waiting　　 D．were waiting
B　
第 * 页
4．在含有宾语从句的复合句中，考生需要记住：当主句为一般过去时态时，从句必须是表过去的某一种时态；若从句叙述的是客观真理、自然现象或永恒不变的规律，从句的时态则不受主句时态的限制，仍然用一般现在时。
第 * 页
【例题】(2018·北京)—Alice, could you tell me ________ London
—Sure.Last Sunday.
A．when Mr.Smith left B．when Mr.Smith will leave
C．when did Mr.Smith leave D．when will Mr.Smith leave
【答案】A
【解析】选项C和D不是陈述语序，因此排除选项C和D。选项A为一般过去时；选项B为一般将来时。由句中的时间标志词“last Sunday ”可知，该题应为一般过去时态，排除选项B。故正确答案为选项 A。
第 * 页
【跟进训练4】(2019·青海)—What did you learn in geography class yesterday
—I learned that the sun ______ in the east.
A．was rising　　　　 B．rises　　　　
C．rose
B　
第 * 页
1．(2019·绵阳改编)The topic of this program is environmental protection.We human beings ____________(do) a lot of things at the cost of the environment to develop economy quickly in the past few years.
2．(2019·德阳改编)Mr.Tian ________(build) two schools for the poor children last year.
3．(2019·宜宾)It _____(be) also the most exciting city in New Zealand.It also has people of many different cultures living there.
四川中考真题精练
have done　
built　
is　
第 * 页
4．(2019·乐山改编)The Russian soup s_______ very nice.I can't wait to drink it.
5．(2020·自贡)Judy was late for class and e_________ the reason to the teacher.
6．(2020·眉山)Alice always b_________ her teeth after meals to have good teeth.
mells　
xplained　
rushes　
第 * 页
7．(2020·自贡)—Alice, have you finished learning the whole book
—Not yet. So far, we ____six units.
A．learned　　　 B．have learned　　　　　　　
C．learn
8．(2020·遂宁)—The new shirt looks good on you. When did you buy it
—On July 7th. I____ it for a week.
A．have bought　　 B．have had
C．bought　　 D．buy
B　
B　
第 * 页
9．(2019·广元)Many old trees and houses ______ by the terrible rainstorm last night.
A．are pulled down　　 B．were pulled down
C．will be pulled down
10．(2019·成都)Be quiet! The students ____ an English exam.
A．take　　 B．are taking　　
C．will take
B　
B　
第 * 页
11．(2019·广元)—What did you do the day before yesterday
—I ______ for an English test.
A．study　　 B．studied　　
C．studying
12．(2019·眉山)—Linda has ______ to Paris.How can I get in touch with her
—Don't worry.She will call you as soon as she ________ there.
A．been；will get　　 B．been；gets
C．gone；will get　　 D．gone；gets
B　
D　
第 * 页
13．(2019·凉山州)—____ did the rainstorm come
—While we ________ a physics lesson yesterday.
A．When；have had　　 B．While；are having
C．When；were having　　 D．While；have
14．(2019·乐山)—You'd better take an umbrella.The weather report says it ____ in the afternoon.
—Thank you.I will put one in my bag.
A．will rain　　　　 B．rains　　　　
C．is raining
C　
A　
第 * 页
15．(2019·眉山)—Your new watch is so nice! When did you buy it
—In October.I ____ it for two months.
A．had　　 B．bought
C．have had　　 D．have bought
16．(2019·宜宾)—According to the timetable, the train ____ at 8：27.
—Don't worry.We can make it.
A．leaves　　 B．is leaving
C．is going to leave
C　
A　
第 * 页
17．(2019·攀枝花)—Please look at the sign.You are not allowed to smoke here.
—Sorry, I ____ it just now.
A．didn't see　　 B．don't see
C．haven't see　　 D．won't see
A　
第 * 页
18．(2018·乐山)—Did you watch the basketball match on TV last night
—I wanted to，but my father____ his favorite TV program.
A．watched　　　 B．was watching 　　　
C．watches
B　
第 * 页
19．(2018·乐山)—Look，what an old bridge! It looks so special!
—Yeah，it ____ nearly 500 years ago.
A．was building　　 B．was built 　　
C．has built
20．(2018·乐山)—There is someone knocking at the door.
—It must be the repairman.I ____ him to come to fix our fridge two hours ago.
A．call　　 B．have called 　　
C．called
B　
C　
第 * 页
21．(2018·宜宾)—I can't find Jimmy.Where is he
—He ____in the garden at the moment.
A．works　　 B．will work　　
C．is working
22．(2018·内江)—Have you watched the new movie，Joe
—No，I____ it with my sister this evening.
A．watch　　 B．are watching
C．watched　　 D．will watch
C　
D　
第 * 页
23．(2018·眉山)—Are you a basketball player in your school
—Yes，I______ the team 3 years ago.I________in it for 3 years.
A．joined；was 　　 B．was joined；am
C．have joined；have been 　　 D．joined；have been
24．(2018·眉山)—Let's go to play soccer，Peter.
—I'm afraid not.I'll need one more hour before my homework____.
A．has finished　　 B．finished
C．will be finished　　 D．is finished
D　
D　
第 * 页
25．(2020·达州)—Jenny, do you know if your mother ____ back tomorrow
—Sorry, I don't know. As soon as she ________ home, I will tell her to call you.
A．comes；gets　　 B．will come；gets to
C．will come；will get　　 D．will come；gets
26．(2018·泸州)Robots ____ more heavy work for us in the future.
A．will do　　 B．did
C．have done　　 D．were doing
D　
A　
第 * 页
27．(2018·泸州)—Could you tell me ______ yuanxiao in China
—Usually at the Lantern Festival.
A．when people eat　　 B．how people eat
C．when do people eat　　 D．how do people eat
28．(2020·乐山)—Hello, John. This is Mike. What are you doing now
—I'm watching a film on TV. It _____at 7：30 and will be on for another hour.
A．starts　　 B．started　　
C．has started
A　
B　
第 * 页
29．(2020·广元)—I asked him a question, but he didn't reply.
—Maybe he ____about something else while you were asking.
A．thought　　 B．thinks　　
C．was thinking
30．(2020·凉山州)—Let's go camping if it______ next Saturday.
—But nobody knows if it ________.
A．is fine；rains　　 B．will be fine；rains
C．is fine；will rain　　 D．will be fine；will rain
C　
C　
第 * 页
31．(2019·雅安)Ben _______ in the library when the rainstorm came.
A．was reading　　 B．had read
C．read　　 D．is reading
A　
第 * 页
一、词汇运用。
1．(2020·贵州黔东南州)At that time I wanted to give up French. Mike _____________(encourage) me and helped me to correct my pronunciation.
2．(2020·浙江嘉兴改编) While we______________ (eat) breakfast, Claudio went upstairs to collect his things.
3．(2019·浙江宁波)At the meeting the boss __________ (赞扬) John for the progress he made.
2021年迎考特训
encouraged　
were eating　
praised　
第 * 页
4．(2020·湖南常德)—What's he doing
—He___________ (use) the computer.
5．(2020·山东聊城)During the summer of 2010，he________ (spend) four weeks at a summer camp.
6．(2018·甘肃武威)An apple a day ________ (keep) the doctor away.
7．(2020·浙江嘉兴改编)My grandfather often__________ (repeat) that he wants to go back and live in the countryside.
8．(甘肃兰州)She ______________(study) English in the school since she left her hometown.
is using　
spent　
keeps　
repeats　
has studied　
第 * 页
9．(2020·江苏南通改编)Boys and girls, join in the summer camp, and you_______________(develop)some basic life skills.
10．(2019·江苏南通改编)
My aunt ____________________ (communicate) with a foreigner when I saw her in the street.
11．(2019·江苏苏州)Miss Zhang __________(订购) a dress online two weeks ago, but it hasn't arrived yet.
12．(2019·江苏泰州)So far, the couple __________________(not change) their flat since they had a second child.
will develop　
was communicating　
ordered　
haven't changed　
第 * 页
13．(2019·江苏常州)He ______________(draw) on the beach from 7 to 9 o'clock yesterday morning.
14．(2019·江苏常州)Mom, I ________________(finish) practising the piano.May I go to play football now
15．(2019·江苏宿迁)Uncle Chen _______________(repair) more than five bicycles since last Friday.
was drawing　
have finished　
has repaired　
第 * 页
二、单项选择。
1．(2019·河北)It ______.Please take an umbrella with you, Annie.
A．rains　　 B．is raining
C．rained　　 D．was raining
2．(2020·浙江温州)—Have scientists found life on Mars
—Not yet, but I think they______it some day.
A．find　　 B．found
C．have found　　 D．will find
B　
D　
第 * 页
3．(安徽)I am surprised at the new look of my hometown，for it ____ a lot over the years.
A．changed　　 B．changes
C．will change　　 D．has changed
4．(2020·天津)—The book is popular. ____ you ________ it yet
—Yes, I have.
A．Are；reading　　 B．Were；reading
C．Have；read　　 D．Will；read
D　
C　
第 * 页
5．(2019·北京)Our school life ____ a lot since 2017.We have more activities now.
A．changes　　 B．changed
C．will change　　 D．has changed
6．(2018·江苏连云港)—Look! Somebody ____ the lights.
—Well, it wasn't me. I didn't do it.
A．turns off　　 B．is turning off
C．was turning off　　 D．has turned off
D　
D　
第 * 页
7．(2019·河北)Sorry, I didn't see you, because I____ a picture.
A．draw　　 B．drew
C．was drawing　　 D．have drawn
8．(山东泰安)With the development of science and technology，robot cooks ____ in our families in the future.
A．appear　　 B．appeared
C．will appear　　 D．is appearing
C　
C　
第 * 页
9．(2019·河北)He____ me his name, but I can't remember it now.
A．tells　　 B．will tell
C．told　　 D．is telling
10．(2019·北京)Sam ____ with his friends every weekend.
A．skates　　 B．is skating
C．has skated　　 D．was skating
C　
A　
第 * 页
11．(2019·湖南湘西州)—Linda，you weren't at home at five o'clock yesterday afternoon.
—I____soccer with my classmates when you called me.
A．play　　 B．was playing
C．was play
12．(2020·北京)I ____ on the computer when Frank called me last night.
A．work　　 B．will work
C．was working　　 D．am working
B　
C　
第 * 页
13．(2020·重庆B卷)Don't drink coffee before going to bed, or you____ easily.
A．don't fall asleep　　 B．won't fall asleep
C．didn't fall asleep　　 D．haven't fallen asleep
14．(2019·湖南湘西州)—____ you ever ________ Hong Kong－Zhuhai－Macao Bridge
—Not yet.
A．Did；visit　　 B．Are；visit
C．Have；visited
B　
C　
第 * 页
15．(2020·江苏无锡)—You promised that you ____ me to Disneyland, Dad.
—Well, I did, dear. But we have to change the plan.
A．will take　　 B．would take
C．has taken　　 D．had taken
16．(2018·江苏盐城)—I ____ my card. I want to report it.
—You can call the bank to report the loss. It would be faster.
A．lose　　 B．was losing
C．will lose　　 D．have lost
B　
D　
第 * 页
17．(2018·湖北恩施州)—Recently, school violence____ in some schools.
—Luckily，our government has carried out some policies to stop it.
A．has appeared 　　 B．appeared
C．will appear
18．(2019·北京)—Tom, what's your dad doing
—He ____ my bike.
A．repairs　　 B．will repair
C．has repaired　　 D．is repairing
A　
D　
第 * 页
19．(2019·广东)It is said that one Greater Bay Area university ____ in Guangdong in the future.
A．will be built　　 B．build
C．will build　　 D．is built
20．(2019·甘肃天水)The teacher asked Li Hua ____.
A．why is he late for class
B．why he is late for class
C．why was he late for class
D．why he was late for class
A　
D　
第 * 页
21．(2019·湖南湘西州)—We will go for a picnic if it ____ this Sunday.
—Sounds great.
A．won't rain　　 B．is sunny
C．will be sunny
22．(2019·湖南株洲)The world is changing with every second；and China, too，____ with every second.
A．is changing　　 B．had changed
C．changed
B　
A　
第 * 页
23．(2019·广东)My father ____ in a panda protection center for 10 years, so he knows a lot about pandas.
A．was working　　 B．is working
C．has worked　　 D．will work
24．(2019·甘肃天水)—Were you at home at 9 o'clock last night
—Yes, I ____ shower at that time.
A．took　　 B．was taking
C．was taken　　 D．am taking
C　
B