题目
________ is known to us all is that China has launched Shenzhou Ⅴ spaceship successfully．（ ）A. ThatB. WhatC. ItD. As
________ is known to us all is that China has launched Shenzhou Ⅴ spaceship successfully．（ ）
A. That
B. What
C. It
D. As
题目解答
答案
B. What
解析
步骤 1：分析句子结构
句子的主干是"________ is known to us all is that China has launched Shenzhou Ⅴ spaceship successfully."，其中"________ is known to us all"是主语从句，"that China has launched Shenzhou Ⅴ spaceship successfully"是表语从句。
步骤 2：确定主语从句的引导词
主语从句中缺少主语，因此需要一个可以充当主语的引导词。在选项中，只有what可以充当主语，相当于the thing that。
步骤 3：验证答案
将what代入句子，句子结构完整，语义通顺，符合题意。
句子的主干是"________ is known to us all is that China has launched Shenzhou Ⅴ spaceship successfully."，其中"________ is known to us all"是主语从句，"that China has launched Shenzhou Ⅴ spaceship successfully"是表语从句。
步骤 2：确定主语从句的引导词
主语从句中缺少主语，因此需要一个可以充当主语的引导词。在选项中，只有what可以充当主语，相当于the thing that。
步骤 3：验证答案
将what代入句子，句子结构完整，语义通顺，符合题意。