Unable to control themselves，some teenagers get hooked by online games，_________

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问题 Unable to control themselves，some teenagers get hooked by online games，________________(这成了老师和家长始终担心的事)．

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答案 which is a constant worry to teachers and parents

解析考查点：1. which引导非限定性定语从句。2. constant表示“始终的，不断的”。特别提示：从前后文来看，该句后半句是对前半句的进一步解释和说明，前半句后使用了逗号，故判定要用非限定性定语从句，用which引导，不能用that。

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