----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
答案:C
考察表语从句。从句的结构很完整,主语是my concern,lie是谓语动词,也是一个不及物动词。Where my concern lies是一个表语从句。意为:那就是我担心的地方。故C正确。