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

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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
单项选择题
Since the accident he has walked with a().

A. slope
B. limp
C. lame
D. strain
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