单项选择题

The flood did not start to()until two days after the rain had stopped.

A. retire
B. recede
C. shrink
D. retreat

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单项选择题

We have to think very carefully before we take any action, because it's a very () situation we are in.

A. ideal
B. favourable
C. good
D. severe

单项选择题

I could hear nothing except the roar of aircraft engines which () all other sounds.

A. overcame
B. overtook
C. suppressed
D. drowned

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