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    精英家教网 > 高中英语 > 题目详情
    4．Science and technology are advancing so quickly that _______ is a possibility today may be a reality tomorrow．（　　）
    A．thatB．whichC．不填D．what

    分析 科技发展这么快，今天不可能的事也许明天就能成为现实．

    解答 答案：D
    题干中so…that…引导结果状语从句；从句中is a possibility today位于may be的前面，是作系动词的主语，是一个主语从句；主语从句中没有主语，要用连接代词；which在名词性从句中表示有范围的选择，句意表达的是抽象的事物．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what在主语从句中起连接作用，同时又充当了从句的主语．

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