问题
选择题
.—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
答案：D
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