【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(huì)越來(lái)越臟，除非我們采取措施保護(hù)他們。since由于，自從……以來(lái)；if 是否，如果；until直到；unless除非，如果不。結(jié)合語(yǔ)境可知選D。

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