regret doing/to do_语法技巧

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。