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    This nationwide smog should serve as a reminder to all, indicating a high time that we ______ on what we've done to the environment.

    A．have reflected B．are reflecting C．will reflect D．reflected 

    D

    解析试题分析：考查虚拟语气。---a high time that从句中用虚拟语气，谓语部分用did或should do，should不能省略。所以答案选D。句意：全国雾霾天气给我们敲响了警钟，表明是时候我们该反思我们对环境做了什么了。
    考点：考查时态

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