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
I'm going to the passport office to have my passport______.
A．stamped
B．stamp
C．being stamped
D．stamping
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