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试题详情
The life of a secret agent is dangerous enough, but the life of a double agent is infinitely more _____: a single slip can send an agent crashing to destruction.
A、arduous
B、precarious
C、clandestine
D、perilous
E、covert
F、exhilarating
答案：B,D
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Sentence Equivalence
我觉得这个题选AC， 和前面的dangerous对应
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