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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:如果我们不采取措施保护他们,这些河流会越来越脏。since由于,自从……以来;if 是否,如果;until直到;unless除非,如果不。结合语境理解,可知选D。

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