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    【题目】If you are addicted to your mobile phone, that’s ______ you should lay it down and be involved in meaningful activities.

    A.whenB.whyC.whereD.how

    【答案】A

    【解析】

    考查表语从句。句意：如果你沉迷于手机，那么该是你放下手机，参加有意义的活动的时候了。此处是表语从句，引导词在从句中作时间状语，应使用when引导。故选A。

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