"He participated in the competition a month ago."
Translation:他一个月前参加比赛了。
November 17, 2017
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julykix
553
他一个月前参加比赛了 = he has already competed (so he doesn't need to this time) 他一个月前参加了比赛 = he participated in a competition a month ago (the competition could still be going on)