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    18．It is still not quite clear ________ on earth really matters in deciding a child's character and personality．（　　）
    A．whenB．whereC．howD．what

    分析 究竟是什么在决定孩子的性格和个性中起真正作用，这一点（现在）还不清楚．

    解答 答案：D  题干所给的句子中，前面是It is still not quite clear 这件事还不清楚；后面接了on earth really matters in deciding a child's character and personality谓语结构（matters用了动词的三单形式），说明是一个句子；从句中matters缺少主语，要用连接代词．故选D．

    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． 本题中it充当形式主语，真正的主语是后面what引导的主语从句．

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