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    Milk will turn sour soon on hot days ______ it is stored in the refrigerator．

    A．since B．until
    C．because D．unless

    D

    解析试题分析：句意：牛奶在热天可能会变酸，除非在冰箱里面储存。这里使用连词unless“除非，如果不”，since“自从”，because“因为”，until“直到”，所以选D。
    考点：考查连词辨析

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