what 引导名词性从句时是连接代词 在从句中起代词作用作主语，宾语 和表语。表语从句是名词性从句。故what在表语从句中也是作主语，宾语，表语。如：
that‘s what happened .作主语 这就是所发生的事。
that's what he did. 作宾语 这就是他所做的。
that's what he is 作表语 这就是他的职业。...
What什么从句呢？It was exactly what I needed!是什么从句？为什么
2个回答
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