单项选择题

I don't know whether it will rain or not, but if it rain, I shall stay at home.

A．does
B．did
C．will
D．shall
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单项选择题
Most environmental problems exist because adequate measures for preventing them______taken in the past.
A．was not
B．were not
C．were not being
D．had not been
单项选择题
Children should read such books ______will make them better and wiser in their life.
A．which
B．what
C．as
D．that
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