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    32．So far no life has been found on Mars, but some experts still think that there some form of life a long time ago. A．might be B．may have been C．should have been D．could be 【查看更多】

     

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    So far no life has been found on Mars, but some experts still think that there ________ some form of life a long time ago．


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

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    So far no life has been found on Mars, but some experts still think that there ________ some form of life a long time ago.

       A. might be       B. may have been         C. should have been        D. could be

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    So far no life has been found on Mars, but some experts still think that there ________ some form of life a long time ago．

    [　　]
    A．

    might be

    B．

    may have been

    C．

    should have been

    D．

    could be

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