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(lái)；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(lái)越臟。結(jié)合語(yǔ)境可知選D。
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