真题练习

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

答案解析

743.答案是D;regret to do sth.对要做的事深表遗憾；regret doing/having done sth.对已做的事后悔。
744.答案是B;动名词作介词的宾语。