【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(jié)合語境可知選D。

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