Mr. Jenkin regretted his secretary for the mistake, for he later discovered it was his own fault.
A. to blame
B. being blamed
C. blamed
D. having blamed
网友回答
A. to blame
B. being blamed
C. blamed
(答案→)D. having blamed
解析： 考查短语：regret doing/having done 后悔做了某事，句意：Mr. Jenkin后悔因为错误责怪了他的秘书，因为他后来发现是他自己的错。故选D。