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    精英家教网 > 高中英语 > 题目详情
    Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
    A．whenB．afterC．beforeD．since
    C

    试题分析：考查固定句型：It will/may be+一段时间+before….过多长时间才/就….句意是：科学家说可能要5到6年这种药才能在病人身上做实验。选C。
    点评：有的固定句型很相似：有的是时态的区别，如果：It is+一段时间+since…,注意辨别清楚。
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