【題目】The river will become dirtier and dirtier ___ we take action to protect it.

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

【答案】D

【解析】句意:這條河將會(huì)變得越來越臟除非我們采取行動(dòng)來保護(hù)它。since自從;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。根據(jù)句意可知應(yīng)選D。

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