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
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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
单项选择题
In spite of his objections, his second wife was determined to him from his two sons.
A．annoy
B．adore
C．affiliate
D．alienate
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