The park is quite different from what it was three years ago.这里为什么用what?

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The park is quite different from what it was three years ago.这里为什么用what?

The park is quite different from what it was three years ago.这里为什么用what?
The park is quite different from what it was three years ago.这里为什么用what?

The park is quite different from what it was three years ago.这里为什么用what?
表示这个公园与3年前大不一样
from 后是what 引导的宾语从句
what it was three years ago= the park that (可见:what=先行词+ 关系代词)it was three years ago

what是连接代词,词义是“所....是事物”,因为需要这样的词义,不用what

这是宾语从句 what做was的宾语。
即换成正常语序:it was what three years ago.