单项选择题

There was a ______ voice, but we didn't know what it was.

A．dim
B．weak
C．gentle
D．faint
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单项选择题
She has a lot of power and influence, but she likes to remain in the ______.
A．background
B．underground
C．compound
D．surround
单项选择题
A driver should concentrate ______ the road when he is driving, or it's easy to bring accidents.
A．to
B．on
C．for
D．in
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