GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 5095HR5VCTJ99M3JA

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