单项选择题

Attempts to restrict parking in the city center have further _________ the problem of traffic congestion, and sometimes the traffic comes to a complete stop in some places.

A．degraded
B．aggravated
C．amplified
D．diffused
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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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The submarine cruising on the sea _________ when it detected the enemy planes.
A．immersed
B．drowned
C．converged
D．submerged
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