They____ have arrived at lunchtime but their flight was delayed.[ ]A. will

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They____ have arrived at lunchtime but their flight was delayed.[     ]
A. will
B. can
C. must
D. should

答案

举一反三

You____ buy a  gift, but you can if you want to.   [     ]
A. must
B. mustn"t
C. have to
D. don"t have to

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— Must I take a bus?
— No, you _____ . You can walk there.    [     ]
A. must not
B. don"t
C. don"t have to
D. had better

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"You _____ smoke in the bedroom,"   Rose said to her husband and pushed him  out of the room.   [     ]
A. needn"t
B. mustn"t
C. dare not
D. won"t

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— What sort of house do you want to have?  Something big?
— Well, it ______ be big-that"s not important.   [     ]
A. mustn"t
B. needn"t
C. can"t
D. won"t

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The boss has given everyone a special  holiday, so we ______ go to work tomorrow.  [     ]
A. can"t
B. mustn"t
C. needn"t
D. shouldn"t

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