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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:河将变得越来越脏,除非我们采取行动来保护他们。since自从;if如果; until直到; unless除非。所以选D。

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