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

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．since

B．after

C．before

D．when

答案

解析

试题分析：考查固定句型：It will/may be+一段时间+before…,要过多长时间才/就…,句意：科学家说要再过五六年这种药物才能在人身上试验。故选C。
点评：It won’t be long before….，要不了多久就会…和这个句型相似的是：It is+一段时间+since…，这两个句型的时态是不同的，要看清楚。

核心考点

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

举一反三

You can come ______ on Tuesday _______ on Friday, but whichever you choose, please let me know.

A．not only; but also

B．both; and

C．neither; nor

D．either; or

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---You look unhappy, what’s happening, my son?
---I’m wondering how long it’ll be________ we come to China again.

A．since

B．when

C．before

D．after

题型：不详难度：| 查看答案

I ____ at my new novel when the big earthquake happened at 2:20 pm.

A．am working

B．was working

C．have worked

D．had been working

题型：不详难度：| 查看答案

I was leaving the office when it suddenly 　　　 to me that I had forgotten my keys.

A．struck

B．happened

C．occurred

D．hit

题型：不详难度：| 查看答案

The crowd cheered wildly at the sight of Liu Xiang, who was reported, throughout the whole country, ____ the world record in the 110-meter hurdle race.

A．breaking	B．having broken
C．to have broken	D．to break

题型：不详难度：| 查看答案

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