—Why didn't you answer the phone last night?—I ___ when you called.

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• 1—Isn't that Ann's husband over there? —No, it ________ be him-I'm sure he doesn't wear glasses.   

  A.can't

  B.must not

  C.won't

  D.may not

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• 2— You shouldn't have talked back to our teacher like that. It was awfully impolite.— You are right. I _________ crazy at that moment.

  A.could have been

  B.can be

  C.must have been

  D.should have been

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• 3There is no light on , they ____ be at home.   

  A.needn't

  B.shouldn't

  C.can't

  D.mustn't

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• 4It ______ be the postman at the door. It's only six o'clock.

  A.mustn't

  B.can't

  C.won't

  D.needn't

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• 5-Shall I pay the bill by check?-Sorry, sir. But it is the management rule of our hotel that payment be made in cash.

  A.can

  B.need

  C.will

  D.shall

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• 6Helen ________ go on the trip with us, but she isn't quite sure yet.

  A.shall

  B.must

  C.may

  D.can

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• 7Since everybody will make a mistake, we ________ at whoever makes mistakes.

  A.ought to have laughed

  B.oughtn't to laugh

  C.ought to laugh

  D.should not to laugh

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