单项选择题

Susan has ______ the elbows of her son’s jacket with leather patches to make it more durable.

A．reinforced
B．sustained
C．steadied
D．confirmed
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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
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
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