【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:如果我們不采取措施保護(hù)他們,這些河流會(huì)越來(lái)越臟。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)境理解,可知選D。

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