单项选择题

He ______ get up at five o'clock in the morning.

A. used to
B. is used m
C. has been used to
D. has used to
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单项选择题
He does not know ______ to deal with the matter and is very worried.
A. what
B. that
C. how
D. as
单项选择题
The road is wet. It ______ last night.
A. should have rained
B. must have rained
C. could have rained
D. must rain
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