I've taken someone else's green sweater by mistakes. It ______ Harry's. He always wears green..

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• 1— Can you imagine what is Jack doing now? He is playing football outside while everyone else is busy in class! — He ________ his homework, I think.

  A.must have finished

  B.must finish

  C.can't have finished

  D.mustn't have finished

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• 2---- There's no light on.   ---- They ________ be at home.

  A.can't

  B.mustn't

  C.needn't

  D.oughtn't to

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• 3The captain urged that the mission ________ before dark.

  A.must be finished

  B.be finished

  C.ought to be finished

  D.was finished

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• 4If my lawyer ______ here last Friday, he _____ me from telling the truth.

  A.had been; would have prevented

  B.had been; would prevent

  C.were; would prevent

  D.were; would have prevented

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• 5---I'm sorry. I ______ at you the other day. --- Forget it. I was a bit out of control myself.

  A.shouldn't shout

  B.shouldn't have shouted

  C.mustn't shout

  D.mustn't have shouted

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• 6— Hi, Tom．Any idea where Mary is?  一 She ______ in the reading room．I saw her there just now．

  A.shall be

  B.should have been

  C.should be

  D.might have been

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• 7You _______ an A on your term paper, but you quoted a little bit more from others' papers.

  A.should receive

  B.could have received

  C.would receive

  D.must have received

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• 8If  we ________ some measures, we might have prevented the environmental pollution．

  A.take

  B.had taken

  C.took

  D.have taken

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• 9For the sake of your health, I'd rather you _______ a flat in the mountain than _______ in downtown area as the transport is getting more convenient.   

  A.bought, one

  B.to buy, that

  C.bought, the one

  D.to buy, what

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• 10——Tom is never late for work. Why is he absent today? —— Something _____to him.

  A.must have happened

  B.can have happened

  C.must happen

  D.can happen

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