宾语从句中what,that的区别the small town where we spent our holiday lies in (what) we think is now part of Chengdu.为什么括号里用WHAT 不用THAT?

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宾语从句中what,that的区别the small town where we spent our holiday lies in (what) we think is now part of Chengdu.为什么括号里用WHAT 不用THAT?
宾语从句中what,that的区别
the small town where we spent our holiday lies in (what) we think is now part of Chengdu.为什么括号里用WHAT 不用THAT?

宾语从句中what,that的区别the small town where we spent our holiday lies in (what) we think is now part of Chengdu.为什么括号里用WHAT 不用THAT?
在这个句子中,因为实在介词in的后面,what we think is now part of chengdu宾语从句,what充当后面句子的成分,如果选that的话,后面的that we think is now part of chengdu不是完整的句子,你可以试着翻译一下

we think is part of chengdu从句缺少成分,what在里面作为句子的一部分
that引导从句,完整的句子。

因为what 既作think 的宾语又做介词in 的宾语,所以只能用what ,介词后不能用that