单项选择题

It will take quite some time（）scientists find any evidence of life in space.

A．after
B．since
C．before
D．for

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单项选择题
I don't know whether it will rain or not, but if it（）, I shall stay at home.

A．will
B．rain
C．is
D．does
单项选择题
Because of Einstein's Theory of Relativity, scientists no longer regarded the world（）

A．as they did before
B．as they before did
C．as did they before
D．as before did they
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