新概念英语练习题
When he had killed the guard,he dragged him into the bushes._____the guard he dragged him into the bushes.
Aon having killed
BWhen killing
CWhen having killed
DOn havingbeen killed老师告诉我们选A,还说只能从句子成分方面考虑.when后加动名词做伴随状语,因为句子的主辅成分颠倒,所以只能选A.但我还是弄不明白