--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 |
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--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 |
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