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

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

【答案】D

【解析】

句意:除非我们采取行动保护这些河流,否则它们会变得更脏。since自从,引导时间状语从句;既然,引导原因状语从句;if如果,引导条件状语从句;until直到时候,引导时间状语从句;unless除非,如果不,引导条件状语从句。根据句意可知应选D。

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