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    , people have done much research in many fields of science. A. In the past fifty years B. Fifth years ago C. Since fifty years D. For the fifty years 【查看更多】

     

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    ________ , people have done much research in many fields of science.


    1. A.
      In the past fifty years
    2. B.
      Fifty years ago
    3. C.
      Since fifty years before
    4. D.
      For the fifty year

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