中考英语动词时态语态非谓语形式专项练习(附答案)

中考英语动词时态、语态以及非谓语形式专项训练（附答案）共五部分：（一）1. When he arrived at the bus stop, the bus ________ for 20 minutes.A. has leftB. had leftC. has been awayD. had been away2. I ______ the League for 5 years so far.A. joinedB. have joinedC. have been in3. The factory ________ since the February of 1988.A . has been open B. has opened C. was open D. opened4. Mary and Rose _______friends since they met in 2000.A. have madeB. have beenC. madeD. have become5.You mustn't ________ until he comes back.A. be awayB. leaveC. be left6.The meeting _______ for a week now.A. has finishedB. has endedC. has been over7.Miss Gao ______ this school for nearly 5 years.A. has been inB. has come toC. has taught8.Ben ______ a teacher for 4 years .A. has beenB. has becomeC. wasD. became9. I ______ home for a week.A. have returnedB. have been backC. returned10. How long _______ he ________ ?A. diedB. has, diedC. has, been dead11. He ______ at eight yesterday afternoon.A. sleptB. was sleepingC. has sleepD. had slept12.He ________ the car for a week.A. boughtB. has boughtC. has had13.-----How long _____ you _____ ill ? -----Two weeks.A. did fallB. have, fellC. have, been14.Since 2000, he _____ his hometown.A. has leftB. has moved awayC. has been away from15.I'll lend you the book , but you can only _____ it for 2 days.A. borrowB. keepC. take16.The bus ______ on the road for 2 hours so far.A. has stoppedB. stoppedC. has been17.Are you _____ the jacket these days?A. wearingB. putting onC. dressingD. on18.He ________ foe 2 hours.A. got upB. has got upC. has been up19. Tom is ill in hospital. He _______ a cold for several days.A. isB. catchesC. has caughtD. has had20.----- How long can I ______ the book? ------ Two weeks.A. borrowB. lendC. getD. keep参考答案：1---5 D C A B B; 6---10 C A A B C; 11---15 B C C C B; 16---20 C A C D D（二）( ) 1. Mr Wang ______ be in Nanjing now, he went to Beijing only this morning.A. mustn’tB. may notC. can’tD. needn’t( ) 2. –Must I saty at home, Mum? --No, you ______.A. needn’tB. mustn’tC. don’tD. may not( ) 3. –Can you go swimming with us this afternoon?--Sorry, I can’t. I _____ take care of my little sister at home because my mother is ill.A. canB. mayC. wouldD. have to( ) 4. –May I go to the cinema, Mum? --Certainly. But you ______ be back by 11 o’clock.A. canB. mayC. mustD. need( ) 5. To make our city more beautiful, rubbish ______ into the river.A. needn’t be thrownB. mustn’t be thrownC. can’t throwD. may not throw( ) 6. –May I go out to play basketball, Dad?--No, you ______. You must finish your homework first.A. mustn’tB. may notC. couldn’tD. needn’t( ) 7. –Where is Jack, please ? --He _____ be in the reading room.A. canB. needC. wouldD. must( ) 8. –Who is the man over there? Is it Mr Li?--No, it ______ be him. Mr Li is much taller.A. musn’tB. may notC. can’tD. needn’t( ) 9. These books ______ out of the reading room. You have to read them here.A. can’t takeB. must be takenC. can takeD. mustn’t be taken ( ) 10. –Mum, may I watch TV now?--Sure, but you ______ help me with my housework first.A. canB. mayC. mustD. could( ) 11. The boy said he had to speak English in class, but he ______ speak it after calss.A. couldB. didn’t have toC. mightD. shouldn’t( ) 12. –Must we hand in the papers now? --No, you ______.A. can’tB. may notC. mustn’tD. needn’t( ) 13. John ______ go there w ith us tonight, but he isn’t very sure about it.A. mustB. canC. willD. may( ) 14. Even the top students in our class can’t work out this problem. So it ______ be very difficult.A. canB. mayC. mustD. need( ) 15. Put on more clothes. You ______ be feeling cold with only a shirt on.A. canB. couldC. wouldD. must( ) 16. It’s still early. You ______.A. mustn’t hurryB. wouldn’t hurryC. may not hurryD. don’t have to hurry( ) 17. –May I stop here? --No, you ______.A. mustn’tB. might notC. needn’tD. won’t( ) 18. A computer ______ think for itself, it must be told what to do.A. can’tB. couldn’tC. may notD. might not( ) 19. –Could I borrow your dictionary? -- Yes, of course you _______.A. mightB. willC. canD. should( ) 20. Peter ______ come with us tonight, but he isn’t very sure yet.A. mustB. mayC. canD. will( ) 21. Michael ______ be a policeman, for he’s much too short.A. needn’tB. can’tC. shouldD. may( ) 22. ______ I know your name?A. MayB. WillC. ShallD. Must( ) 23. You ______ be more careful next time.A. have toB. mayC. mustD. might( ) 24. You ______ miss the lesson, though we ______ have it on Thursday.A. mustn’t; needn’tB. needn’t; mustn’tC. mustn’t; mustn’tD. needn’t; needn’t( ) 25. This pen looks like mine, yet it isn’t. whose ______ it be?A. mustB. mayC. wouldD. can( ) 26. What kinds of homes will we live in the future? Nobody ______ be sure, but scientists are working out new ideas now.A. willB. mayC. canD. must( ) 27. I ______ like to know where you were born.A. shallB. shouldC. doD. may( ) 28. ______ you be happy!A. MightB. MustC. WishD. May( ) 29. A teacher ______ do every exercise, but a student must.A. may notB. needn’tC. can’tD. mustn’t( ) 30. The matter ______ be changed into a gas, but it _______ be heated to its boiling point.A. may; needn’tB. may; canC. mustn’t; needn’tD. can; must( ) 31. Teachers and students ______ look coldly at you for a day or two, but there are friendly feelings in their hearts.A. mustB. canC. mayD. should( ) 32. Cars and buses ______ stop when the traffic lights turn red.A. canB. needC. mayD. must( ) 33. –Do you think his story ______ true? --I don’ think so. But it sounds good.A. must beB. may beC. can beD. has to be( ) 34. Look out! The knife is very sharp. You ______ cut your finger.A. needB. mustC. shouldD. may( ) 35. –How long ______ the book be kept?--For two weeks, but you ______ return it on time.A. can; mayB. may; needC. can; mustD. must; need( ) 36. – May I have an apple, Mum?--Certainly. But you ______ wash your hands first?A. mayB. mustC. canD. need( ) 37. –There is a lot of smoke coming out of the teaching building there.--Really? It ______ be a fire, most probably.A. canB. ought toC. mayD. must( ) 38. –Shall I tell John about the bad news?--No, you ______. I think that will make him sad.A. needn’tB. wouldn’tC. shouldn’tD. mustn’t ( ) 39. –Could I call you by your first name? --Yes, you ______.A. willB. couldC. mayD. might( ) 40. –Let’s go to the cinema, shall we? -- _______.A. No, I can’tB. Yes, I willC. Yes, thank youD. No, we’d better not ( ) 41. --______ the man there be our new teacher?--He ______ be, but I’m not sure.A. May; mustn’tB. Can; mayC. Must; can’tD. Can; can’t( ) 42. –Sometime is knocking at the door. Who ______ it be?--It ______ be T om. He is still in the school.A. can; can’tB. can; mustn’tC. might; couldD. might; may参考答案：1—5 CADCB 6—10 ADCDC 11—15 BDDCD 16—20 DAACB21—25 BACAD 26—30 CCDBD 31—35 CDCDC 36—42 BBDCDBA（三）( ) 1. -- How long may I ______ your book?--For a week. But you musn’t ______ it to others.A. borrow; lendB. keep; lendC. lend; borrowD. keep; borrow( ) 2. It won’t ______ them much time to fly to Beijing from Shanghai.A. spendB. useC. takeD. pay( ) 3. Mr Wang ______ be in Nanjing now, he went to Beijing only this morning.A. mustn’t beB. may notC. can’tD. needn’t( ) 4. –Do you like the music the Moonlight Sonata? --Yes, it ______ really beautiful.A. feelsB. soundsC. listensD. hears( ) 5. Lily finished _______ the book yesterday.A. readB. readingC. to readD. reads( ) 6. Mrs Brown isn’t here. She has to ______ her baby at home.A. look atB. look forC. look likeD. look after( ) 7. I have to go now. please remember to _______ the lights when you leave.A. turn offB. turn downC. turn upD. turn on( ) 8. Susan’s parents have bought a large house with a swimming pool.It _______ be very expensive.A. mustB. canC. mustn’tD. can’t( ) 9. –It’s too hot. Would you mind _______ the door? -- _______. Please do it now.A. to open; OKB. opening; Certainly notC. opening; Of courseD. to open; Good idea( ) 10. I want to _______ this book for a month.A. borrowB. keepC. lendD. get( ) 11. –How many times _______ you _______ to Beijing this year? --Three times.A. have; beenB. had; beenC. have; goneD. had; gone( ) 12. What a nice bag! But she _______ only thirty dollars for it.A. costB. tookC. spendD. paid( ) 13. Cotton _______ nice and soft.A. is feltB. is feelingC. feelD. feels( ) 14. I think this is the best way to solve the problem. Do you _______ me?A. play withB. hear ofC. agree withD. get on well with ( ) 15. –Guess who is coming to supper. –I don’t know. _______ me.A. SpeakB. SayC. TellD. Tell( ) 16. Please _______ your phones here with you tomorrow.A. takeB. bringC. carryD. lift( ) 17. Don’t _______ your lessons. We’ll help you.A. worryB. worried aboutC. be worried aboutD. be afraid( ) 18. The window is broken. Try to _______ who broke it.A. find outB. findC. lookD. look for( ) 19. He could _______ neither French nor German. So I ______ with him in English.A. speak; talkedB. talk; toldC. say; spokeD. tell; talked( ) 20. The ticket is on the floor. Would you please _______ for me?A. pick it upB. pick up itC. pick up themD. pick them up( ) 21. If you don’t know a word, you must _______ the word in a dictionary.A. look upB. look downC. look overD. look out( ) 22. It’s time for class. We’d better _______.A. stop to talkB. to stop to talkC. stop talkingD. to stop talking( ) 23. There was a strange sound outside. Mary went out and _______ around, but she _______ nothing.A. looked; sawB. saw; sawC. watched; lookedD. looked; find( ) 24. The woman _______ the child quickly and took him to hospital.A. put onB. dressedC. had onD. was wearing( ) 25. –Oh, you painted the walls yourself?--Yes. It was not hard. The whole work didn’t _______ much.A. wantB. costC. spendD. pay( ) 26. --_______ all your things, Tom! I hate them here and there. –OK, Mum.A. Put upB. Put onC. Put downD. Put away( ) 27. Yuki loves wearing strange hats because she wants people to _______ her.A. believeB. controlC. noticeD. visit( ) 28. _______! It’s the music of Mozart. Be quiet.A. HearB. SoundC. SingD. Listen( ) 29. –The room is so dirty. _______ we clean it? -- Of course.A. WillB. WouldC. DoD. Shall( ) 30. We must do something to stop people from _______.A. to throw litter aboutB. to throw litter intoC. throwing litter aboutD. throwing litter into参考大拿：1—5 BCCBB 6—10 CAABB 11—15 ADDCC 16—20 BCAAA 21—25 ACABB 26—30 DCDD（三）( ) 1. Don’t make so much noise. We _______ to the music.A. listenedB. listenC. are listeningD. have listened( ) 2. I must return the camera to Li Lei. I _______ it for two weeks.A. keepB. borrowedC. have keptD. have lent( ) 3. –When will you tell him the good news?--I will tell him about it as soon as he _______ back.A. comesB. cameC. will comeD. is coming( ) 4. –Dad, please open the door, it _______. –OK, dear. I’m coming.A. locksB. lockedC. is lockedD. was locked( ) 5. –Did you go to Jim’s birthday party? --No, I _______.A. am not invitedB. wasn’t invitedC. haven’t invitedD. didn’t invite( ) 6. A talk on Chinese history _______ in the school hall next week.A. be givenB. has been givenC. will be givenD. will give( ) 7. You may go fishing if your work _______.A. is doneB. will be doneC. has doneD. have done( ) 8. –What do you think of the football match yesterday?--Well. It’s surprising. The strongest team of our school _______.A. was beatenB. wonC. scoredD. was failed( ) 9. –Would your younger brother go for a picnic this Sunday?--If I don’t go, _______.A. so does heB. so he willC. neither will heD. neither does he ( ) 10. The trees must _______ three times a week.A. waterB. is wateringC. be wateredD. waters( ) 11. –Did you see Tom at the party? -- No, he _______ by the time I got there.A. leftB. was leavingC. had leftD. has left( ) 12. –Why not go to see the dolphin show with me? --Because I ______ it.A. sawB. will seeC. seeD. have seen( ) 13. –Do you like watching cooking programs on TV?--No, I don’t, but my twin brother _______. He’s very fond of cooking.A. doesB. doC. isD. are( ) 14. Catherin _______ the letter before her mother came into her bedroom.A. has writtenB. was writtenC. had writtenD. is writing( ) 15. The old man is quite weak after the accident, so he _______.A. must take care ofB. must be take care ofC. must look afterD. must be looked after( ) 16. The ticket is on the floor. Would you please _______ for me?A. pick it upB. pick up itC. pick up themD. pick them up( ) 17. He _______ living in the country to the city.A. likesB. prefersC. enjoysD. loves( ) 18. How long have you _______ the book?A. boughtB. lentC. hadD. borrowed( ) 19. –Do you know him well ? --Sure. We _______ friend since ten years ago.A. wereB. have beenC. have becomeD. have made( ) 20. _______ me carefully, boys and girls. Can you _______ me?A. Listen to; hearB. Hear; listen toC. Hear; hearD. Listen to; hear from ( ) 21. –These farmers have been to the United States. –Really? When ______ there?A. will they goB. did they goC. do they goD. have they gone ( ) 22. I’m sorry I haven’t got any money. I _______ my handbag at home.A. have missedB. have leftC. have putD. have forgotten ( ) 23. –Where is Miss Gao. Lily? --She _______ to the teacher s’.A. has beenB. has goneC. wentD. would go( ) 24. When her father came back home, Joan _______ with her friend.A. talkedB. talksC. is talkingD. was talking( ) 25. –What’s that thing with three legs?--It’s a cup. It ______ for drinking in the old days.A. usesB. usedC. is usedD. was used( ) 26. His uncle _______ in three days.A. returnsB. has returnedC. returnedD. will return( ) 27. –Hi, Lin Tao. I didn’t see you at the party.--Oh, I _______ ready for the maths exam.A. am gettingB. was gettingC. gotD. have got( ) 28. –Excuse me. What did you say you would like to do, Miss White?--I said I’d better go back to the office. I _______ something this afternoon.A. would meetB. meetC. am going to meetD. was meeting ( ) 29. What _______ the forest in our country in the last ten years.A. has happened doB. is happened toC. has happened atD. is happening ( ) 30. –What did Mr Jones do before he moved here?--He _______ a city bus for over twenty-five years.A. is drivingB. droveC. has drivenD. drives( ) 31. –When _______ you _______ your homework?--I had finished it before he _______ back.A. have; finished; cameB. have; finished; was comingC. did; finish; cameD. did; finish; was coming( ) 32. Look! The boys _______ happily in the river.A. swimB. swamC. will swimD. are swimming( ) 33. Every spring, many trees _______ along the river.A. were plantedB. is plantedC. will be plantedD. are planted( ) 34. The letter _______ in French. I can’t read it.A. is writingB. is writtenC. wroteD. writes( ) 35. If Mary _______ next Sunday, we will go boating together.A. will comeB. comesC. shall comeD. should come( ) 36. We expected that the English teacher _______ some advice on how to write an English letter.A. will giveB. gaveC. is going to giveD. would give( ) 37. Five years ago nobody knew him, although he _______ more than 100 songs.A. already wroteB. have already writtenC. had already writtenD. was already writing( ) 38. So far I _______ any success. However, I’ll keep trying.A. don’t haveB. didn’t haveC. haven’t hadD. won’t have( ) 39. It was the third time that I _______ in at his office.A. have droppedB. had droppedC. droppedD. was dropping ( ) 40. I often see Tom _______ homework while I am watching TV every evening.A. doB. doingC. didD. to do( ) 41. The flowers want _______. Look, the soil is so dry.A. wateringB. being wateredC. to waterD. waters( ) 42. –Be careful! You might fall into the water.--Thank you. I ______ I _______ so close to the pool.A. didn’t know; am standingB. don’t know; am standingC. didn’t know; was standingD. didn’t know; would stand( ) 43. –Excuse me. Where is the sick boy sent here a moment ago?--He ______ by the doctorA. has been examinedB. will be examinedC. is examinedD. is being examined( ) 44.—Have you got the airplane tickets?--No. when I _______ to the office, all the tickets to Beijing ______ out.A. get; have been soldB. got; had been soldC. got; had soldD. got; were being sold( ) 45. –Your name again? I _______ quite catch it. –Bartholomew Liveli.A. didn’tB. don’tC. couldn’tD. can’t( ) 46. – Whom are you waiting for?--Gary’s parents. But neither of them _______ yet.A. arrivedB. has arrivedC. are arrivingD. is arriving( ) 47. He _______ in bed all day long because he had a headache.A. lieB. layC. laidD. lied( ) 48. Would you _______ your voice a little so that everyone can hear you?A. riseB. putC. liftD. raise( ) 49. More and more people began to _______ that good health means good wealth.A. learnB. understandC. considerD. realize参考答案：1—5 CCACB 6—10 CAACC 11—15 CDACD 16—20 ABCBA 21—25 BBBDD 26—30 DBCAB 31—36 CDDBB 36—40 DCCBB 41—45 ACDBA 46—49 BBDD（四）1.It’s very important for us to learn English by_________(make) flashcards.2.We__________(take ) notes when the teacher had a lesson.3.I think_______(wear) tie looks really cool.4.It ____________ (seem) that they’re playing basketball on the playground.5.Students should be ___________ (allow) to study with friends.6.When they are together, they talk instead of __________ (do) homework.7.You’re only twelve years old. Don’t get your ears _____________ (pierce).8.It’s raining now. We have to put off ____________ (have ) a picnic.9.It takes me half an hour __________ (walk) to work every day.10.I f it __________ (be) fine, we’ll go fishing tomorrow.11.H e ___________ (live) in Beijing since he was eight years old.12.I think the computer ____________ (invent) before the TV.13.H e said he____________ (be) to the Great Wall four times.14.B y the time I got home, my parents ____________ (have) supper.15.W hat’s your plan for the coming holiday? I ___________ (visit) Beijing if possible.16.T he foreigners are getting used to____________ (use) the chopsticks.17.A t first she had trouble __________ (make ) compete sentences.18.I think _____________ (memorize) the words of pop songs also helps a little.19.J im is often alone. He doesn’t seem ____________ (have) many friends.20.A s a middle school student, you should stop __________ (wear) that silly earring.21.C heng long _______________ (make) some great movies over the year.22.W hy it is easier ____________ (learn) Chinese than English?23.M y father used ____________ (get) up early.24.A s the name ____________ (suggest) , he is a quiet boy.25.B e sure ___________ (close) the windows when you leave.26.I f I ___________ (be) you, I would take a long walk before ________(go) to bed.27.Y ou look tired. Why not _____________ (have) a short rest?28.M y brother often practices _______________ (play) soccer after school.29.I t’s too noisy. They must ____________ (listen) to the rock music now.30.I like singers who ___________ (be) really cool.31.S hanghai ________________ (become) a modern city over the years.32.H e doesn’t know where ____________ (go) for the vacation.33.H e decided ______________ (chat) with his friend on the net.34.I am considering ______________ (join ) the English club next week.35.S unglasses are used for ____________ (keep) out the sun.36.I _____________ (feed) my cat, so it is full now.37.M any tall buildings ________________ (build) in our city during the last few years.38.Y ou shouldn’t make him______________ (stand) so long.39.M y brother will call me as soon as he ______________ (reach) here.40.S he said she _________________ (not write) to her parents for a long time.41.T hese homeless children _____________ (look) after in the SOS village.42.H is uncle _______________ (return) in three days.43.S o far, they_________________ (plant) thousands of trees.44.I’m sorry ___________ (keep) you __________ (wait) for me for such a long time.45.H e was made ____________ (sing) a song for his little mistake.46.J ust then I was frightened, I heard someone ___________ (walk) towards to me.47.T he baby is sleeping. Would you mind ___________ (turn) off the radio?48.D o you enjoy __________ (listen) to the pop music?49.Y ou had better not to go out now. It ___________ (rain) heavily.50.I f I had a million dollars, I _____________ (give) it to the charity.51.N ancy said that loud music made her __________ (feel) sad.52.I __________ (oversleep) because my alarm clock didn’t go off.53.S he told me she ____________ (go) on a beach vacation next month.54.S hanghai is cold this time of year. You need _____(pack) warm clothes if you ____(go)there.55.T he man under the tree ___________ (call) T om comes from India.56.W hat if everyone else ___________ (bring) a present to the party?57.W e are looking forward to _________ (become) a volunteer.58.H e likes _________ (drop) by his friends’ homes on weekends.59.I n the United States, you’re not supposed ____________ (eat) with your hands.60.W hen I got to school, I realized I __________ (leave) my homework at school.参考答案：1. making2. were taking3. wearing4. seems5. allowed6. doing7. pierced8. having9. towalk 10. is 11. has lived 12. was invented 13. had been 14. had had 15. will visit 16. using 17. making 18. memorizing 19. to have 20. wearing 21. has made 22. to learn 23. to get 24. suggests 25. to close 26. were. Going 27. have 28. playing 29. be listening 30. are 31. has become 32. to go 33.to chat 34. joining 35. keeping 36. have fed 37. have been built 38. stand 39. reaches 40. hadn’t written 41. are looked 42. will return 43. have planted 44. to keep ,waiting 45. to sing 46. walking 47. turning 48. listening 49. is raining 50. would give 51. feel 52. overslept 53. would go 54. to pack , go 55. called 56. brings 57. becoming 58. dropping 59. to eat 60. had left（五）1.The maths problem can be______.A.easy worked outB.easy to be worked outC.easily worked outD.easily to work out2.Every possible means______,but none proves successful.A.has been triedB.triedC.is being triedD.has tried3.The girl is to______a rich man.A.marry withB.be marriedC.marry toD.be married to4.He received a telegram that______“Mother sick”.A.wroteB.saysC.readsD.read5.Who can you imagine______to his wedding party?A.invitingB.being invitedC.was invitedD.to be invited6.I______ten minutes to decide whether I should reject the offer.A.gaveB.was givenC.was givingD.had given7.——Will somebody go and get Dr.White?——He’s al ready been______.A.asked forB.sent forC.called forD.looked for8.A conductor______to keep us in time in the singing yesterday.A.needsB.is needingC.was neededD.has been needed9.When and where to build the new factory______yet.A.is not decidedB.are not decidedC.has not decidedD.have not decided10.Ways______to stop pollution by now.A.must findB.will be foundC.are foundD.have been found11.I don’t want anything______about it.A.to sayB.saidC.sayingD.having said12.——______that the sports meet might be put off.——Yes,it all depends on the weather.A.I’ve been toldB.I’ve toldC.I’m toldD.I told13.A library with five thousand books______to the nation as a gift.A.is offeredB.has offeredC.are offeredD.have offered14.Betty has never been heard _______ill of others.A.speakB.spokenC.to speakD.was said15.Tom______to have delivered the speech in their theatre room.A.saidB.saysC.is saidD.was said16.——What do you think of the book?——Oh,excellent.It’s worth______a second time.A.to readB.to be readC.readingD.being read17.Little Jim should love______to the theatre this evening.A.to be takenB.to takeC.being takenD.taking.18.______more attention,the trees could have grown better.A.GivenB.to giveC.GivingD.Having given19.How long______the English party______?A.has;been lastedB.did;lastC.was;astedD.will;be lasted20.Shakespeare was said______37 famous plays in his lifetime.A.finishing writingB.to finish writingC.having writtenD.to have written21.——My watch______twelve o’clock.It’s so late. ——Let’s hurry up.A.is saidB.saysC.is toldD.tells22. The bridge which ______ last year looks really beautiful.A. was builtB. builtC. was set upD. had been built.23. "Have you seen the art exhibition?""No, _____ there. "A. it was not being heldB. they didn't holdC. it had not heldD. they were holding it24. "This cloth _____well and _____ long. ""Ok. I'll take it. "A. washes/lastsB. is washed/lastedC. washes/is lastedD.iswashing/lasting25. "Hurry up, you ______ on the phone. ""Oh, I'm coming. Thank you. "A. are wantedB. are being wantedC. wantD. are wanting26. After a while an agreement _____.A. was arrived atB. was arrived inC. was arrivedD. has been arrived27. How much do you think that vase _____?A. is costB. usedC. was paid forD. cost28. This liquid _____ the salt at room temperature.A. became mixed withB. was mixed by。