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

     

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


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

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    Scientists say it may 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 may 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 may 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 may be five or six years_______it is possible to test this medicine on human patients.

    A．whenB．afterC．beforeD．since

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