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, ______ (这成了教师和家长始终提心的事).

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答案 which is a constant worry to teachers and parents

解析 ①which引导非限定性定语从句。②constant表示“始终的，不断的”。要特别提示的是从前后文来看，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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Unabletocontrolthemselves,someteenagersgethookedbyonlinegames,______