If the lights were on, they ________ have been at home.[ ]A. mayB. canC. mus

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If the lights were on, they ________ have been at home.[ ]
A. may
B. can
C. must
D. should

答案

举一反三

You _____ smoke when you see the sign

. [     ]
A. must
B. should
C. mustn’t
D. needn’t

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You ____ swim here. It is said that sharks have been seen.[ ]
A. can
B. may
C. mustn’t
D. needn’t

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-Can I __________ your camera?
-Sure, here you are.[ ]
A. borrowed
B. lend
C. lent
D. borrow

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—Who is the woman that is watering flowers? Is it your mother?
—No, it _________be her. She went shopping just now.      [     ]
A. mustn"t
B. may not
C. can"t
D. needn"t

题型：期末题难度：| 查看答案

—_____ you come to my birthday party tomorrow, Robert?
—I"m afraid not. I have to study for my exam.[     ]
A. Must
B. Should
C. Can
D. Need

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