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The rivers will become dirtier and dirtier _______ we take action to protect them.
A．sinceB．ifC．untilD．Unless
D

試題分析：句意：除非我們采取行動來保護這些河流，否則他們將會變得越來越臟。Unless表示“除非”，引導條件狀語從句；since意為“自從……以來”和until意為“直到……才”都引導時間狀語從句；if意為“如果”，引導條件狀語從句，故選D。
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