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-The police have caught the murderer.-Yes,and he admitted __

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-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
为什么不选B呢,B和C都是完成时表示发生在谓语动词之前,且admitted+to do sth,.
admit doing sth. 当admit在被动态时才是be admitted to do sth.