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    精英家教网 > 高中英语 > 题目详情
    The air ______ different gases _____ together.
    A．consist of, mixingB．is made up of, mixed
    C．consisting of, mixedD．makes up, mixing
    B

    试题分析：考查固定词组。固定词组consist of="be" made up of由…组成；consist of没有被动语态，没有进行时。本题第二空的gas与mix构成被动关系，故使用过去分词的形式mixed。句意：空气是有混合在一起的不同的气体组成的。故B正确。
    点评：固定词组consist of="be" made up of由…组成；consist of没有被动语态，没有进行时。本题要注意分析句子结构，第一空所填的是句子的谓语动词，第二空的mixed together是修饰名词gases.
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