[译] 他后悔失去了一个出国的好机会。
[误] He repented to have missed a good opportunity to go abroad.

[正] He repented of having missed a good opportunity to go abroad.
[注] repent 表示“悔悟，后悔”，通常用作不及物动词，不直接跟宾语，更不可以用动词不定式作宾语。如表示“后悔做了某事”，应该说 report of having done sth.。