The captain urged that the mission ______ before dark.

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• 1---The book is borrowed from the library. You _______ your children touch it with their dirty hands. 　---Sorry.　    

  A.should have let　

  B.needn't have let　

  C.mustn't have let

  D.ought not to have let

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• 2------I don't know why he has made such a silly mistake in the exam. ------ He ______ it before he handed in the paper.

  A.may have checked

  B.might check

  C.must have checked

  D.should have checked

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• 3The little girl _____ go out at night and often imagined _____ a monster following her

  A.dared not；there being

  B.dare not；there being

  C.did not dare；there to be

  D.didn't dare to；there be

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• 4The next generation of telescopes will reveal（显露；揭示）new parts of our universe that will seem surprising, just as the moon's craters（坑）______ when observed 400 years ago．

  A.could seem

  B.might seem

  C.should have seemed

  D.must have seemed

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• 5一I still cannot figure out why he missed his flight． 一He ______ an accident on the way to the airport．

  A.could have had

  B.should have had

  C.would have had

  D.must have had

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• 6We have been excavating layers of ash almost six metres thick, which suggests that they _______the fire burning all winter.

  A.should keep

  B.might have kept

  C.should have kept

  D.might keep

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• 7—Guess what! I have got A for my term paper. —Great! You  _______  read widely and put a lot of work into it.

  A.must

  B.should

  C.must have

  D.should have

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• 8—Do you regret paying twenty dollars for the dictionary? —No．I ____ twice as much for it．

  A.gladly paid

  B.should gladly pay

  C.would gladly have paid

  D.had gladly paid

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• 9It's nearly 7 o'clock. Helen _______ come, but let's wait for her for another 5 to 7 minutes.

  A.couldn't

  B.can't

  C.mustn't

  D.may not

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• 10It is suggested that such a law ______.

  A.needn't be passed

  B.mustn't be passed

  C.not be passed

  D.will be passed

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