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    精英家教网 > 高中英语 > 题目详情
    Scientists say it may be five years ______ it is possible to test this medicine on human patients．
    A．sinceB．untilC．beforeD．when
    C
    本题考查连词。句意：科学家说可能还要五六年才可能将此药试验在人身上。before引导时间状语从句, 表示 “过了……就”。
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