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
No Tobacco Day is the day when the world Health Organization ______ to people to stop using tobacco products.
A．asks
B．applies
C．appeals
D．urges
单项选择题
No one hopes that he will ______ his usefulness.
A．retain
B．keep
C．prolong
D．survive
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