单项选择题

Since the road is wet this morning, ______ last night.

A．it must rain
B．it must be raining
C．it must have rained
D．it must have been rain
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单项选择题
Two hundred dollars ______ a large sum of money to the old man.
A．is
B．is to be
C．are
D．are to be
单项选择题
21（）

A．have
B．do
C．haven't
D．does
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