It was only after he had read the papers________ Mr. Gross realized the task before him was extremely difficult to complete.

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• 第1题：

  Since nobody gave him any help, he have done the research on his own.
  A、can
  B．must
  C．would
  D．need
  

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• 第2题：

  I got to the office earlier that day, ________ the 7:30 train from Paddington.
  A、caught
  B．to have caught
  C．to catch
  D．having caught
  

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• 第3题：

  It may not be a great suggestion.But before ________ is put forward, we’ll make do with it.
  A、a good one
  B．a better one
  C．the best one
  D．a best one
  

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• 第4题：

  The watch was very good, and he ________ 20 percent down for it.
  A、paid
  B．cost
  C．bought
  D．spent
  

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• 第5题：

  We________very early so we packed the night before.
  A、leave
  B．had left
  C．were leaving
  D．have left
  

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• 第6题：

  
  A、serious study of physics is impossible________some knowledge of mathematics.
  A、against
  B．before
  C．beyond
  D．without
  

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