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    5．Air must   fresh ail the time．It's good for our health．（　　）
    A．keepB．is keptC．be kept

    分析 空气必须一直保持清新，这对我们的健康有利．

    解答 答案C 情态动词的被动语态结构：情态动词+be+过去分词．空气的清新是被人类保持的，也就是keep这个动作的承受者，所以要用被动语态．故选C．

    点评 首先要明白情态动词被动语态的构成，然后结合句意做出正确选择．

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