—Where is Jack?I can't find him anywhere. —He__________ his homework upstairs.

试卷相关题目

• 1They must have been enjoying themselves there,otherwise they _________ so long.

  A.can't have stayed

  B.wouldn't have stayed

  C.needn't have stayed

  D.couldn't stay

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• 2If we throw away too much waste and can't keep good ecosystem,we _________ our future.

  A.must have destroyed

  B.could be destroying 

  C.may be destroying

  D.must destroy 

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• 3There _________ be any difficulty about winning the speech contest now that you're well prepared for it.

  A.mustn't

  B.shan't

  C.shouldn't

  D.needn't

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• 4No matter how the enemy frightened him ,he ______say a word .

  A.did not

  B.could not

  C.might not

  D.would not

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• 5You _______ be tired—you've only been working for an hour.

  A.must not

  B.won't

  C.can't

  D.may not

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• 6The sun rises in the east and sets in the west，so it seems as if the sun ________ round the earth.

  A.were circling

  B.circles

  C.is circling

  D.be circling

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• 7There were already five people in the car but they managed to take me as well . It ______ a comfortable journey .

  A.can't e

  B.shouldn't be

  C.mustn't have been

  D.couldn't have been

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• 8Had the boy worked harder,he__________the exams.

  A.must have got through

  B.could get through

  C.ought to get through

  D.would have got through

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• 9The work ______ be finished in such a short time .

  A.wasn't able to

  B.couldn't

  C.ought

  D.could

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