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
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单项选择题
He suddenly returned ______ a rainy night.
A．at
B．during
C．in
D．on
单项选择题
The sun ______ in the east and sets in the west.
A．rises
B．raises
C．lifts
D．rose
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