单项选择题

He suddenly returned ______ a rainy night.

A．at
B．during
C．in
D．on
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单项选择题
Hardly ______ when a loud explosion was heard.
A．the train had started
B．the train had been started
C．had the train started
D．did the train start
单项选择题
There were then more than 200 children ______ music in the school.
A．to study
B．studying
C．study
D．studied
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