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    14．No one believed his reason for being late ______ he was caught in a traffic jam，which made him embarrassed．（　　）
    A．thatB．whyC．whereD．whether

    分析 没人相信他是因为交通拥堵而迟到的理由，这让他很尴尬．

    解答 答案：A  题干中he was caught in a traffic jam是解释reason的内容，是一个同位语从句；句意表达的是事实，要用that来连接．故选A．

    点评 在句子中起名词作用的各种从句统称为名词性从句．根据它们在句中的语法作用，这类从句又可分为主语从句，同位语从句，表语从句和宾语从句．

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