these ancient indians used to live in what is now a part of ...为什么用what 而不用which?

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these ancient indians used to live in what is now a part of ...为什么用what 而不用which?

these ancient indians used to live in what is now a part of ...为什么用what 而不用which?
these ancient indians used to live in what is now a part of ...为什么用what 而不用which?

these ancient indians used to live in what is now a part of ...为什么用what 而不用which?
还没有一个实体的时候用what指代一个实体.
已经有了几个实体的时候,用which指代其中一个实体.

这是宾从,改成先行词加which的定从可以,the place which