regret having done sth。； regret a previous mistake：例句： If I‘d known then what was going to happen， I wouldn’t have done as I did。
早知今日，悔不当初。
why did you do that If you would have known this？
觉得好怪。。。
早知今日，悔不当初英语翻译如下：
If I‘d known then what was going to happen， I wouldn’t have done as I did。
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