单项选择题

The streets are all wet. It ______ last night.

A．must be raining
B．must have been mining
C．had to rain
D．must have rained
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单项选择题
This is the best book ______ I've ever bought.
A．with which
B．that
C．which
D．when
单项选择题
She is indifferent ______ hardship and dangers.
A．of
B．at
C．in
D．to
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