The rivers will become dirtier and dirtier we take action to protect them.A. since B. if C. until D. unless 题目和参考答案——青夏教育精英家教网—

题目内容

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

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

【解析】

试题分析：句意：如果我们不采取措施保护他们，这条河只会越来越脏。since 自从……以来；until直到；unless除非，如果不。根据句意，故选D

考点：考查连词的用法。

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