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题目内容
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.
- Aarduous
- Bprecarious
- Cclandestine
- Dperilous
- Ecovert
- Fexhilarating
B,D显示答案
以上解析由 考满分老师提供。