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    【题目】The rivers will become dirtier and dirtier ______ we take action to protect them.

    A. since B. if

    C. until D. unless

    【答案】D

    【解析】

    试题分析：句意：这些河流会越来越脏，除非我们采取措施保护他们。since由于，自从……以来；if 是否，如果；until直到；unless除非，如果不。结合语境可知选D。

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