单项选择题

I must have ______ for ten minutes before the telephone operator put me through.

A．hung about
B．hung up
C．hung on
D．hung round
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单项选择题
The local medical officer reported a serious ______ of food-poisoning.
A．state
B．incident
C．outbreak
D．event
单项选择题
An executive has to have a lot of ______ to reach the top.
A．attention
B．acceleration
C．affection
D．ambition
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