----Many online games are full of violence, which do harm to the development of the childr

----Many online games are full of violence, which do harm to the development of the children.
----And that’s my concern lies.
A. what
B. which
C. where
D. that

A. whatB. which(答案→)C. whereD. that解析：考查表语从句。本题中的where引导的是表语从句where mu concern lies，where在句中做状语。句意：—很多在线的游戏都充满了暴力，这对孩子的发展是有害的。—那就是我所担心的地方。本句中的Lie是一个不及物动词，后面不要直接加宾语，也没有介词，故使用连接副词做状语。故C正确。

谢谢回答！！！