—Robert is indeed a wise man.
—Oh，yes.How often I have regretted his advice!
A. to take
B. taking
C. not to take
D. not taking
网友回答
A. to take
B. taking
C. not to take
(答案→)D. not taking
解析：regret doing sth.“后悔做过某事”；regret to do sth.“抱歉要做某事”。由题干可知，要用D项表示“对没接受建议而感到后悔”。