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    18．Measures must be taken to prevent pollution ________ happily．（　　）
    A．from we liveB．for us to liveC．us livingD．from our living

    分析 必须采取措施阻止污染以便我们能幸福地生活．

    解答 答案是B．本题考查动词不定式充当目的状语；题干中prevent pollution的"目的"是为了幸福生活，故用动词不定式的复合结构"for sb．to do sth．"表示目的，答案选择B．本题容易误看成短语prevent sb．（from） doing（阻止某人做…），而选择C和D，C和D语义不符；

    点评 首先判断选项中的动词在句中是以谓语还是非谓语形式出现，然后根据选项在句中的功能结合非谓语的基本用法做出合理的判断．要关注常见非谓语动词的搭配．

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