【单选题】—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
【单选题】—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
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