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    精英家教网 > 高中英语 > 题目详情
    5．________ they should do about the hole in their roof is their most pressing problem．（　　）
    A．ThatB．How oftenC．WhatD．Why

    分析 如何修复屋顶上的那个洞是他们最急迫的事情．

    解答 答案：C．
    分析句子的结构可知，________ they should do about the hole in their roof 为句子的主语部分，也就是说该部分需要一个用来引导主语从句的引导词，且该引导词在主语从句中作动词do的宾语，所以需要使用what来引导；that引导主语从句时不作任何成分，how often表示频率，why表示原因；均不符合语境；故选C．

    点评 本题考查名词性从句中的主语从句，要会分析句子的成分，并且掌握what的用法．

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