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题目
题型:不详难度:来源:
Scientists say it may be five or six years_______it is possible to test this medicine on human patients.
A.whenB.afterC.beforeD.since

答案
C
解析

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。
核心考点
试题【Scientists say it may be five or six years_______it is possible to test this med】;主要考察你对句式等知识点的理解。[详细]
举一反三
It was only 3 hours      the policeman caught the robber.
A.beforeB.sinceC.whenD.that

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There is no doubt _______ my friend is not satisfied with what they have done.
A.thatB.whetherC.ifD.why

题型:不详难度:| 查看答案
It remains________ whether Jim will be fit enough to play in the finals.
A.seenB.to be seenC.seeing D.to see

题型:不详难度:| 查看答案
          any further information, please contact us in our office in London.
A.Should you requireB.You should require
C.Must you requireD.You must require

题型:不详难度:| 查看答案
---- It is said that Tom had a wonderful time at the party.
---- ______, and so did I.
A.So did heB.Nor did heC.So he didD.Nor he did

题型:不详难度:| 查看答案
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