【題目】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】

試題分析：句意：這些河流會越來越臟，除非我們采取措施保護他們。since由于，自從……以來；if 是否，如果；until直到；unless除非，如果不。結合語境可知選D。

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