regret doing/to do
regret to do　对要做的事遗憾。　（未做）
regret doing　对做过的事遗憾、后悔。　（已做）
I regret to have to do this, but I have no choice.
我很遗憾必须这样去做，我实在没有办法。
I don’t regret telling her what I thought.
我不为告诉她我的想法而后悔。
典型例题
——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：D.regret having done sth. 对已发生的事感到遗憾。regret to do sth. 对将要做的事感到遗憾。本题为对已说的话感到后悔，因此选D.

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