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    精英家教网 > 初中英语 > 题目详情
    The rivers will become dirtier and dirtier _______ we take action to protect them.
    A．sinceB．ifC．untilD．Unless
    D

    试题分析：句意：除非我们采取行动来保护这些河流，否则他们将会变得越来越脏。Unless表示“除非”，引导条件状语从句；since意为“自从……以来”和until意为“直到……才”都引导时间状语从句；if意为“如果”，引导条件状语从句，故选D。
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