For centuries, scientists tried to explain（  ）a solar eclipse took place。

试卷相关题目

• 1By the time he was twelve, Edison（  ）to make a living by himself。

  A.would begin

  B.has begun

  C.had begun

  D.was begun

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• 2We'll start as soon as our team leader（  ）。

  A.comes

  B.came

  C.will come

  D.iscoming

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• 3There was plenty of time,She（  ）。

  A.mustn’thave hurried

  B.couldn’t have hurried

  C.needn't have hurried

  D.mightn’t have hurried

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• 4“Can I leave the window open at night?“You（  ）better not。”

  A.should

  B.would

  C.could

  D.had

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• 5He drives much（  ）than he did two years ago。

  A.careful

  B.carefully

  C.moirecareful

  D.moirecarefully

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• 6The brain is capable ignoring pain messages if（  ）to concentrate on other activities。

  A.it allowed

  B.allowed

  C.isit allowed

  D.allow it

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• 7It is necessary that an efficient worker（  ）his work on time。

  A.accomplishes

  B.accomplished

  C.accomplish

  D.has accomplished

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• 8I would have told you the answer had it been possible, but I（  ）so busy then。

  A.bad been

  B.ware

  C.was

  D.am

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• 9Tom was disappointed that most of the guests （  ）when he（  ）at the party。

  A.1eft; had arrived

  B.left; arrived

  C.had left; had arrived

  D.had left; arrived

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• 10The police found that the house（  ）and a lot of things（  ）。

  A.has broken into; has been stolen

  B.had broken into; hadbeenstolen

  C.has been broken into; stolen

  D.had been broken into; stolen

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