【題目】The rivers will become dirtier ________ we take action to protect them.

A. since B. if C. until D. unless

【答案】D

【解析】

句意:除非我們采取行動(dòng)保護(hù)這些河流,否則它們會(huì)變得更臟。since自從,引導(dǎo)時(shí)間狀語(yǔ)從句;既然,引導(dǎo)原因狀語(yǔ)從句;if如果,引導(dǎo)條件狀語(yǔ)從句;until直到時(shí)候,引導(dǎo)時(shí)間狀語(yǔ)從句;unless除非,如果不,引導(dǎo)條件狀語(yǔ)從句。根據(jù)句意可知應(yīng)選D。

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