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
Maine has ______ weather than most of the other states in the continental United States.
A．a cooler
B．the coolest
C．cooler
D．the cooler
单项选择题
George is one of those people who ______ trouble in working out this problem.
A．has
B．have
C．get
D．gets
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