You look so tired. You________have stayed up late again.[ ]A．should B．canC．

题型：同步题难度：来源：

You look so tired. You________have stayed up late again.[     ]
A．should
B．can
C．may
D．must

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举一反三

—Do you know where David is? I couldn"t find him anywhere.
—Well. He ________ have gone far-his coat"s still here.[ ]
A. shouldn"t
B. mustn"t
C. can"t
D. wouldn"t

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When a friend gave Tom a ticket he to the game. [ ]
A. couldn"t help but go
B. couldn"t help but going
C. can"t help but go
D. can"t help but going

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I was really anxious about you. You        him without a word.    [      ]
A. mustn"t have
B. shouldn"t have left
C. couldn"t have left
D. needn"t leave

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The weather turned out to be fine yesterday. I     the trouble to carry my umbrella with me.     [     ]
A. should have taken
B. could have taken
C. needn"t have taken
D. mustn"t have taken

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— Why does Sara know so much about Angkor Wat?
—She ________have been there, or ...[     ]
A. must
B. oughtn"t to
C. may
D. Can"t

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