Scientists say it may be five or six years_______it is possible to test this med

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

A．when

B．after

C．before

D．since

答案

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。

举一反三

It was only 3 hours the policeman caught the robber.

A．before

B．since

C．when

D．that

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There is no doubt _______ my friend is not satisfied with what they have done.

A．that

B．whether

C．if

D．why

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It remains________ whether Jim will be fit enough to play in the finals.

A．seen

B．to be seen

C．seeing

D．to see

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any further information, please contact us in our office in London.

A．Should you require	B．You should require
C．Must you require	D．You must require

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---- It is said that Tom had a wonderful time at the party.
---- ______, and so did I.

A．So did he

B．Nor did he

C．So he did

D．Nor he did

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