【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:除非我們采取行動保護這些河流,否則它們會變得更臟。since自從,引導時間狀語從句;既然,引導原因狀語從句;if如果,引導條件狀語從句;until直到時候,引導時間狀語從句;unless除非,如果不,引導條件狀語從句。根據(jù)句意可知應選D。

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