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    ( ) Scientists say it may be a few years it is possible to test the new medicine on patients. A. because B. after C. before D. since 【查看更多】

     

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    Scientists say it may be a few years _____ it is possible to test the new medicine on patients．

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

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    Scientists say it may be a few years ______it is possible to test the new medicine on patients.

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

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