5．________ they should do about the hole in their roof is their most pressing problem．（　�。�
A．ThatB．How oftenC．WhatD．Why

分析 如何修復(fù)屋頂上的那個(gè)洞是他們最急迫的事情．

解答 答案：C．
分析句子的結(jié)構(gòu)可知，________ they should do about the hole in their roof 為句子的主語部分，也就是說該部分需要一個(gè)用來引導(dǎo)主語從句的引導(dǎo)詞，且該引導(dǎo)詞在主語從句中作動(dòng)詞do的賓語，所以需要使用what來引導(dǎo)；that引導(dǎo)主語從句時(shí)不作任何成分，how often表示頻率，why表示原因；均不符合語境；故選C．

點(diǎn)評(píng) 本題考查名詞性從句中的主語從句，要會(huì)分析句子的成分，并且掌握what的用法．

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