The rivers will become dirtier and dirtier ______ we take action to protect them.
A.sinceB.ifC.untilD.unless
D
since由于,自從……以來;if 是否,如果; until直到;unless除非,如果不。句意:如果我們不采取措施保護(hù)他們,這些河流會(huì)越來越臟。結(jié)合語(yǔ)境可知選D。
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