—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：考查动名词：句意：--罗伯特真是一个聪明的男人！---哦，确实。多少次我都后悔没听他的建议regret (not) doing sth 后悔（没）做某事，regret to do很遗憾要做…，选D。