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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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
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
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