单项选择题

The U.S was in 1850 a (divided) nation half slave and half free.

A．allied
B．combined
C．united
D．separate
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单项选择题
I (spotted) my father in the crowd.
A．recognized
B．recalled
C．received
D．recorded
单项选择题
The Department of Resources notified the town council that the water supply was (contaminated).
A．cut
B．dangerous
C．diverted
D．polluted
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