单选题
When we were in the mountains, we often found ourselves entirely
enveloped
by the fog.
A、
confined
B、
surrounded
C、
darkened
D、
blocked
【正确答案】
B
【答案解析】
confine限制；surround包围，环绕；darken使变暗；block封锁，阻塞；envelope封袋，包膜。
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