To those scientists, it still remains to be a question ______ man can go back to

题型：不详难度：来源：

To those scientists, it still remains to be a question ______ man can go back to the old days with time machine.

A．if

B．that

C．how

D．whether

答案

解析

略

举一反三

7. ---________ do you think of the play we saw just now?
---Wonderful! But not as interesting as the one we saw last Saturday.

A．What

B．How

C．Why

D．Where

题型：不详难度：| 查看答案

Great changes have taken place in that village. It is no longer ____ it was 10 years ago, ____ it was so poor.

A．what; when	B．that; which
C．what; which	D．which; that

题型：不详难度：| 查看答案

Simply ring me up, _______I’ll come to your help as soon as possible.

A．so

B．and

C．but

D．or

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．He thought she was a pretty girl_______poorly she was dressed.

A．how

B．as though

C．as long as

D．however

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Responsibility for family is ________ happiness exists when you think of your parents and children.

A．which

B．what

C．where

D．whether

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