推测的单词

（）1. Our government declared that people________drive after drinking alcohol．

A. mustn't　  B. needn't   C. couldn't   D. wouldn't

答案：A

解析：mustn’t表示绝对禁止，一定不能，谁这么做，谁就是犯罪。

（）2. —Mary, do you have any plans for this weekend?

—I'm not sure. I________just stay at home.

A. must　  B. need　   C. can   D. may

答案：D

解析：有I'm not sure表明不确定性，因此不能用十分肯定的must，必须用不确定的may。

（）3. —Look! The boy at the gate________be Jack. He is always standing there every morning.

—No, it________be him. He is ill and doesn't go to school today.

A. must; can't    B. must; mustn't     C. can; can't   D. will; won't

答案：A

解析：第一空是肯定的推测，用must。第二空是否定的推测，用can’t。但不管是肯定推测，还是否定推测，都是站在说话人的立场，表达他内心的认知。

（）4. —What's that noise?

—It________be my son playing computer games. He's very naughty.

A. can    B. must    C. will    D. need

答案：B

解析：肯定的推测用must。

（）5. —She looks very happy. She ______ have passed the exam.—I guess so. It’s not difficult after all.

A. should    B. could    C. must   D. might

答案：C

解析：表示肯定的推测用must。本句中是must have passed是对过去发生事情的肯定推测（翻译成肯定是已经通过了）。如果是must pass就是对现在的推测（翻译成肯定通过，没有那种完成的感觉）。就通过考试这个表达来说，一定是must have passed才符合语境。

（）6. —Who is the man over there? Is it Mr Li?—No, it ______ be him. Mr Li has gone to America.

A. mustn't    B. may not    C. can't    D. needn't

答案：C

解析：can’t表示否定推测，虽然是否定推测，但是说话人的心中十分“确信、肯定”，确定“那不是李先生”这件事是事实。

（）7. To make our city more beautiful, rubbish ______ into the river.

A. needn't be thrown   B. mustn't be thrown   C. can't throw  D. mustn’t throw

答案：B

解析：表示明令禁止，mustn’t是一定不要的意思。没有别的意思。Must才是推测，mustn’t不是推测。

（）8. —Susan has bought a large house with a swimming pool.—It ______ be very expensive. I never even dream about it.

A. must   B. might    C. can’t    D. shouldn’t

答案：A

解析：表示肯定的推测用must。

（）9. —Listen! Is Professor Johnson giving a report in the hall?—No, it______ be him. He has gone to Japan.

A. needn’t   B. may not    C. mustn’t    D. can’t

答案：D

解析：can’t表示否定推测，虽然是否定推测，但是说话人的心中十分“确信、肯定”。

（）10. If the traffic light is red, you ________ cross the road. It’s very dangerous.

A. don’t    B. mustn’t    C. needn’t    D. wouldn’t

答案：B

解析：表示明令禁止，mustn’t是一定不要的意思。没有别的意思。Must才是推测，mustn’t不是推测。

（）11.—Listen!I think it______be Miss Wang singing in the office.

—No.It______be her.She left for Beijing just now.

A.must;can't     B.may ;mustn't     C. must;mustn't

答案：A

解析：第一空肯定推测，第二空否定推测。

（）12.It's everyone's duty to protect our environment. And I do believe if all of us pull together,____ something we can do to improve our living condition.

A. it must be      B. there must be    C. there must have

答案：B

解析：表示肯定的推测。

（）13.—We________take photos when visiting the Province Museum.

—I can't agree with you more.

A.can't     B.mustn't     C.needn't

答案：B

解析：表示明令禁止，mustn’t是一定不要的意思。没有别的意思。Must才是推测，mustn’t不是推测。

（）14.Look at the “No Photos” sign. You ________ take photos in the art museum.

A. should     B. mustn’t     C. needn’t

答案：B

解析：表示明令禁止，mustn’t是一定不要的意思。没有别的意思。Must才是推测，mustn’t不是推测。

（）15.-Listen! I think it_____be Mr.White singing in the office.

-No. It ______ be him. He left for London just now.

A.must;can't    B.may;mustn't    C.must;mustn't

答案：A

解析：第一空肯定推测，第二空否定推测。

（）16.—Where's Jean?

—I'm not sure. She____in the laboratory.

 A. is     B.might be     C.must be

答案：B

解析：因为不确定，所以不能用十分肯定自信满满的must。

（）17.-Where's Jeff?

-I'm not sure.He_____be playing football on the playground.

A. can    B. may      C.must

答案：B

解析：因为不确定，所以不能用十分肯定自信满满的must。

（）18.The light in his room is still on. He______be working on his computer now because the report is due tomorrow.

A. may     B. can     C. must

答案：C

解析：肯定的推测用must。

（）19.—Look at the girl crying in the corner.Is she your younger sister?

—It_____be her. She was taken to my grandparents' home last week.

A.mustn't     B.can't     C.may not

答案：B

解析：否定推测用can’t.

（完）