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

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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
单项选择题
It was because he was too inexperienced（）she didn't know how to deal with the situation.

A．so
B．as
C．that
D．then
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