—You were brave enough to raise obje

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—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

参考答案:

D

regret 后所跟动词有 to do 与 doing 两种形式,不定式表示“为做某事而遗憾”, doing 表示“为做过某事而后悔”。“ having done ”则更强调动作已发生而无法挽回。