Many kids the net bar and had a bad effect on their studies.A. are addicted to; itB. get

问题补充：

Many kids the net bar, and had a bad effect on their studies.

A. are addicted to; it

B. get engaged in; which

C. are related to; what

D. are addicted to; which

答案：

(答案→)A. are addicted to; it

B. get engaged in; which

C. are related to; what

D. are addicted to; which

解析：be addicted to 意思是“对…上瘾”，符合题意。And 是一个并列连词，后面应该是并列句，而不是从句，因此排除B和D。be related to“与…有关”，不符合题意，因此排除。