单项选择题

I could hear nothing but the roar of the airplane engines which ______ all other sounds.

A．overturned
B．drowned
C．deafened
D．smoothed
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单项选择题
At that time, the economy was still undergoing a ______, and job offers were hard to get.
A．concession
B．supervision
C．recession
D．deviation
单项选择题
The meaning of the sentence is ______; you can interpret it in several ways.
A．skeptical
B．intelligible
C．ambiguous
D．exclusive
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