问题描述：
求解释这句话中的定语从句成分!
Recently a number of cases have been reported of young children duplicating a violent act previously seen on TV .
previously seen on TV .没省略的时候是that was previously seen on TV 如果是的话不是只能省略what么,be动词去哪里了?
that不是what，打错了
Recently a number of cases have been reported of young children duplicating a violent act previously seen on TV .
previously seen on TV .没省略的时候是that was previously seen on TV 如果是的话不是只能省略what么,be动词去哪里了?
that不是what，打错了
问题解答：
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