____ we call a computer is really a kind of tool that can do work for manA.That B.What选B 怎么分析句子?

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____ we call a computer is really a kind of tool that can do work for manA.That B.What选B 怎么分析句子?

____ we call a computer is really a kind of tool that can do work for manA.That B.What选B 怎么分析句子?
____ we call a computer is really a kind of tool that can do work for man
A.That B.What
选B 怎么分析句子?

____ we call a computer is really a kind of tool that can do work for manA.That B.What选B 怎么分析句子?
that, what都可以引导主语从句.即整个从句做主语.
试看:that he loves her is so obvious.(他爱她)是很明显的.
what he just said is very funny.(他刚才说的一番话)真是有趣极了.

既然都可以引导主语从句,那两者有什么区别呢.
区别就在于:that作为引导词,本身不在从句中不担当成份,只是一个符号的作用.你看:that he loves her这个从句中,that能做从句he loves her的什么成份没有?所以that只是一个符号,指代的是“他爱她”这个事实.
而what作为引导词,则本身在主语从句里是要做成份的.它本身是名词性的,所以可以在从句中做主语或者作宾语.
先看之前的例句:
(what he just said)is very funny.前面的主语从句中,what是引导词,本身又是从句中said 的宾语,因为是“他说的那番话”.
所以现在来看你的原句:如果是选A的话,that we call a computer.那么“我们叫电脑”这件事的事实,可以做为is really a kind of tool的主语吗?显然不可以,某件事怎么实际上是某种工具了呢?
再来看what we call a computer.这样说的意思就是“我们所称之为电脑的东西”. we call what a computer,如果你还看不出语序的话.

B what
被我们称为电脑的东西是一种可以为人服务的工具

"被我们叫做电脑的东西的确是一种能为人们工作的工具"
“What”代替后面的...
此用法较常用
与此相同的还有“it”

我们叫电脑是 什么
看意思!
What we call ,很经常用的