— Is Jack on duty today? — It _____ be him. It's his turn tomorrow.

试卷相关题目

• 1— Who is the girl standing over there? — Well, if you _____ know, her name is Mabel.

  A.may

  B.can

  C.must

  D.shall

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• 2The teacher ____ have thought Johnson was worth it or she wouldn't have wasted time on him, I suppose.

  A.should

  B.can

  C.would

  D.must

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• 3I have told you the truth. _____ I keep repeating it?

  A.Must

  B.Can

  C.May

  D.Will

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• 4— Yao Yuan, a disabled woman, won the National Championships Cup last week. — My goodness! She ______ a lot of difficulties!

  A.may go through

  B.might go through

  C.must have gone through

  D.ought to have gone through

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• 5—You never think of others! You kept me waiting for two hours. —I'm sorry that you _____ think so.

  A.would

  B.could

  C.might

  D.should

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• 6Great efforts to increase grain production _____ if food shortages are to be avoided.

  A.could be made

  B.must be made

  C.might be made

  D.would be made

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• 7In fact you ____ outside by taxi. My car was here.

  A.couldn't go

  B.mustn't have gone

  C.needn't have gone

  D.needn't go

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• 8_____ anyone phone, tell them I'm in conference.

  A.Would

  B.Shall

  C.Could

  D.Should

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• 9— Tom graduated from college at a very young age. — Oh, he _____ have been a very smart boy then.

  A.could

  B.should

  C.might

  D.must

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• 10According to the air traffic rules, you _____ switch off your mobile phone before boarding.

  A.may

  B.can

  C.would

  D.should

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