Try the new cleaner. Just a few minutes every day－that’s all it takes－_________

题型：不详难度：来源：

Try the new cleaner. Just a few minutes every day－that’s all it takes－_________ you could have shining floors and furniture.

A．but

B．and

C．or

D．so

答案

解析

略

举一反三

I am ashamed, sir, that I wasted the many hours __________ I should have studied in class.

A．while

B．before

C．which

D．when

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you feel so terrible now, you may as well see the doctor quickly.

A．As long as

B．For

C．Now that

D．So that

题型：不详难度：| 查看答案

We were on the point of discussing financial investment_____ the telephone rang unexpectedly.

A．while

B．when

C．as

D．once

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His timely warning was_____ help us avoid being cheated.

A．so as to

B．such as to

C．so that

D．such that

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It is not until recently ______ the scientists have found proof of there being water on Mars.

A．when

B．that

C．how

D．what

题型：不详难度：| 查看答案