Question

---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

Answer 1

D

本题考查regret的用法。句意：我现在后悔在会上提出了反对意见。表示对已经发生的事情“后悔”应用regret doing ／having done。