单项选择题

They made detailed investigations to ______ themselves with the needs of the rural market.

A．adhere
B．acknowledge
C．acquaint
D．activate
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单项选择题
The police carded out an ______ investigation ,but the missing woman was not yet found.
A．exhausting
B．exhaustible
C．exhaustive
D．exhausted
单项选择题
After the music had ______ there was a storm of applause.
A．died out
B．died hard
C．died off
D．died away
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