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
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(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。