单选题 -- You were brave enough to make such a suggestion at the meeting. -- Well, now I regret ＿＿＿＿＿＿＿＿ that. 的答案

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题目内容：
-- You were brave enough to make such a suggestion at the meeting.
-- Well, now I regret ＿＿＿＿＿＿＿＿ that.
题目选项

to have done

having done