isknowntoallisthattheDiaoyu

is known to all is that the Diaoyu Islands have belonged to China since ancient times.A.As B.It C.WhatD.That

C解析试题分析：句意：我们都知道钓鱼岛自从古代就属于中国。That在主语从句中不做成分，只起连接是作用；这里缺少主语从句的连词，并且连词在句中做主语，根据句意故选C。考点：考查主语从句的用法。点评：本题难度适中。主语从句是一个重要的语法点，主语从句是中学阶段的重点语法项目,也是高考的热点之一。即学即练： he was successful is still a puzzle.A. As B. How C. What D. That解析B。句意：他是如何成功的仍然是个谜。

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