—The police have caught the murderer.　　 —Yes, and he admitted his boss on a rainy night s

—The police have caught the murderer.
　　 —Yes, and he admitted his boss on a rainy night seven years ago.
A. to kill
B. to have killed
C. having killed
D. have been killing

A. to kill B. to have killed (答案→)C. having killed D. have been killing解析：在delay, admit, avoid, suggest, advise, practise, finish, mind, enjoy等动词后,只跟动名词而不跟动词不定式作宾语。错答B者只考虑到kill动作发生在admit之前,但不知admit doing这一用法。

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