.—You were brave enough to raise objections at the meeting. —Well now I regret _ that.A.

问题补充：

.—You were brave enough to raise objections at the meeting.

—Well, now I regret _ that.

A. to do

B. to be doing

C. to have done

D. having done

答案：

A. to do

B. to be doing

C. to have done

(答案→)D. having done

解析：regret to do sth意为对将要做的事表示遗憾,而regret doing/having done sth意为对做过的事情表示遗憾。

【标签】非谓语动词