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
It was in the winter of 1951 ______ a heavy fog moved into London.
A．that
B．then
C．when
D．/
单项选择题
Your sister used to visit you quite often, ______
A．isn't she
B．use not she
C．wasn't she
D．didn't she
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