类型：单选题

问题： —You were brave enough to raise objections (反对) at the meeting. —Well, now I regret ______that.

选项：

A. to do

B. to be doing

C. to have done

D. having done

答案：D

解析：

本题考查非谓语动词。regret to do表示遗憾去做某事，regret doing表示后悔做过某事，根据文意可知选择后悔含义比较合适。选择D。句意：-你在会上提出反对意见真的很勇敢。-嗯，我现在后悔了。