单项选择题

The streets are all wet. It ______ last night.

A) must be raining
B) must have been raining
C) had to rain
D) must have rained
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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
单项选择题
The Olympic Games, ______ in 776 B.C., did not include women players until 1912.
A) first playing
B) to be first played
C) first played
D) to be first playing
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