8.4 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.
  I don't regret telling her what I thought. 

---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。