题目

题型：不详难度：来源：

        is known to all is that the Diaoyu Islands have belonged to China since ancient times.

A．As

B．It

C．What

D．That

答案

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。
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。