---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
D
本題考查regret的用法。句意：我現(xiàn)在后悔在會上提出了反對意見。表示對已經(jīng)發(fā)生的事情“后悔”應(yīng)用regret doing ／having done。 
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