.The robber ,----the bank clerk and run away ,was caught by the police yesterday A having killedThe robber ,----the bank clerk and run away ,was caught by the police yesterdayA having killed B killing C.killed

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.The robber ,----the bank clerk and run away ,was caught by the police yesterday A having killed
The robber ,----the bank clerk and run away ,was caught by the police yesterday
A having killed B killing C.killed

答案为A.整个句子主语是The robber 谓语是was caught (被动语态).having killed the bank clerk and run away 是分词词组做状语,所以不能选c,同时是过去加完成时态,所以不能选b.就剩下a了.

A 因为THE ROBBER 和KILL 是主动关系,且发生在谓语动词之前,因此使用现在分词的完成式