因为要表示过去式和过去分词。
mentioned:
v. 提及，说起，谈到（mention的过去式和过去分词）
Nobody mentioned anything to me about it.
没人跟我提过这事。
His name has been mentioned as a future MP.
有人提到他，认为他将来可以当下院议员。
He mentioned en passant that he was going away.
他顺便提到他要离开。
He bitterly regretted ever having mentioned it.
他非常懊悔提起那件事。
