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    Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
    A．sinceB．afterC．beforeD．when
    C

    试题分析：句意：科学家说可能过武或六年才有可能把这种药在病人身上试验。since 自从；  after 在......之后；before 在......之前；  when 当......时候；It is /will be +时间段+before+（一般现在时的）句子“过多久才......”故选C。
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