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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．sinceB．after?
    C．beforeD．when?
    C?
    此题考查几个时间连词在状语从句中的区别。five or six years 是时间段，就应该找能表示点与点之间关系的连词。since+过去时间点，主句常用现在完成时；after无法确定时间段；when只表点，不表段；所以用before表从现在到测试那一天。
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