Most children have other opportunities, in addition to after-school hours, in which they can choose whether to play computer games or to interact with other people.
要适应英文句子构造。。。我已开始也做错了。
in which的定语从句修饰的是after-school hours,in addition说明除此之外还有别的内容。这样就同时削弱了电玩儿童和社交儿童。