英语简单选择求详解As is recorded in history,silkworms were first rais

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英语简单选择求详解
As is recorded in history,silkworms were first raised in(what) is today Hebei Province.
请问为什么括号里的不能选which呢?

what具体代表某个东西,而which则不能.
例如：what I say 我所说的（东西）
很高兴为你解答!
老师祝你学习进步!
望采纳,多谢你的问题!^_^
再问：定语从句中的which也不能代表某个东西吗？
再答：这里不是定语从句，而是介词in的宾语从句。意为：在今天称之为河北省的地方。

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