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The rivers will become dirtier and dirtier ______ we take action to protect them.
A.sinceB.ifC.untilD.unless
D
since由于,自从……以来;if 是否,如果; until直到;unless除非,如果不。句意:如果我们不采取措施保护他们,这些河流会越来越脏。结合语境可知选D。
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