Such a problem still exists because no adequate measures for preventing it _____ taken in the past.

试卷相关题目

• 1I know a little bit about the city as I ______ there for one year in my youth.

  A.am studying

  B.had studied

  C.studied

  D.have studied

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• 2Sharon _____ in a big city for many years, but she is now content to live in the countryside.

  A.lived

  B.was living

  C.have lived

  D.had lived

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• 3— Did you tidy your room?— No, I was going to tidy my room but I _____ visitors.

  A.had

  B.have

  C.have had

  D.will have

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• 4Judy is going to marry the sailor she _____ in Rome last year.

  A.meets

  B.met

  C.has met

  D.would meet

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• 5Sales of CDs have greatly increased since the early 1990s, when people _____ to enjoy the advantages of this new technology.

  A.begin

  B.began

  C.have begun

  D.had begun

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• 6— Do you want a lift home? — It's very kind of you, but I have to work late in the office. I overslept this moming because my alarm clock _____.

  A.doesn't go off

  B.won't go off

  C.wasn't going off

  D.didn't go off

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• 7— Why are the two students standing at the gate of the teachers'office?— They _____ to each other in class and _____.

  A.have whispered; are punishing

  B.had whispered; were punished

  C.whispered; are being punished

  D.are whispering; were being punished

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• 8I was out of town at the time, so I don't know exactly how it _____.

  A.was happening

  B.happened

  C.happens

  D.has happened

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• 9The plan he devoted three months to _____ at last.

  A.failing

  B.fail

  C.failed

  D.has failed

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• 10There used to be a cinema here. I _____ lots of wonderful movies in it.

  A.have seen

  B.had seen

  C.would have seen

  D.saw

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