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743.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
744.I must apologize for _______ ahead of time.
That's all right.
A.letting you not know
B.not letting you know
C.letting you know not
D.letting not you know
