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

问题补充：

. ---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

答案：

A. to do

B. to be doing

C. to have done

(答案→)D. having done

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