单项选择题

The submarine cruising on the sea _________ when it detected the enemy planes.

A．immersed
B．drowned
C．converged
D．submerged
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单项选择题
He received a(n) _________ letter threatening to disclose his affair with that woman.
A．ambiguous
B．vigorous
C．anonymous
D．autonomous
单项选择题
The young man _________ from his normal good habits by becoming drunk once.
A．deviated
B．detached
C．derived
D．descended
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