－You were brave enough to raise objections at the meeting.

－Well, now I regret ________ that.

[　　]

—You were brave enough to raise objections at the meeting.
--Well , now I regret ____that.

--You were brave enough to raise objections at the meeting.
---Well, now I regret____ that.

--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

—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