Scientists say it may be five or six years _____ it is possible to test this med - 高中英语试题 - 超级试练试题库

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Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.

A．since

B．after

C．before

D．when

答案

C

解析

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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试题【Scientists say it may be five or six years _____ it is possible to test this med】；主要考察你对句法等知识点的理解。[详细]

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