Scientists say it may be five or six years_______it is possible to test this medicine on human patie

题目简介

Scientists say it may be five or six years_______it is possible to test this medicine on human patie

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
题型:单选题难度:偏易来源:不详

答案

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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