单项选择题

They are well ______ with each other since they were little kids living in the same community..

A．identified
B．recognized
C．acknowledged
D．acquainted
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单项选择题
We have not obtained very much experiment data ______ conclusion between the two possibilities.
A．on which to base
B．to base on
C．which is based on
D．to be based on
单项选择题
A free lookout ______ the hills with binoculars.
A．scanned
B．scrutinized
C．explored
D．swept
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