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    Although there is no life on Mars now, some experts think that there some form of life a long time ago. A. might be B. may have been C. can have been D. could be 【查看更多】

     

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    Although there is no life on Mars now, some experts think that there ________ some form of life a long time ago.


    1. A.
      might be
    2. B.
      may have been
    3. C.
      can have been
    4. D.
      could be

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