--You were brave enough to raise objections at the meeting.
---Well, now I regret____ that.
A．to doB．to be doingC．to have doneD．having done
D

試題分析：regret to do sth. 很遺憾地做...（事情還沒有做）； regret doing sth. 后悔做了...（為已經(jīng)做過的事而感到后悔），這里表示為已經(jīng)做過的事而感到后悔，故選D
點評：解答這類題目，關鍵是理解題干意思以及各選項詞組的意思，可以像數(shù)學中的代入法一樣，依次把各個選項意思放入句子中進行比較，不難選出正確答案。
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