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【题目】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】句意:河流会变得越来越脏,除非我们采取行动保护它们。since自从;if如果;until直到;unless除非;如果不。根据句意可知选D。

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