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    Scientists say it will be five or six years it is possible to test this medicine on human patients. A. since B. that C. before D. when 【查看更多】

     

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     Scientists say it will be five or six years __________ it is possible to test this medicine on humans.

    A. after                        B. before                     C. since                        D. when

     

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    Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.

    A．before

    B．that

    C．since

    D．when

     

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    Scientists say it will be five or six years ________ it is possible to test this medicine on humans．


    1. A.
      after
    2. B.
      before
    3. C.
      since
    4. D.
      when

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     Scientists say it will be five or six years ____ it is possible to test this medicine on human patients.

        A. since                 B. after                  C. before               D. when

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    Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.

    A．beforeB．thatC．sinceD．when

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