A modern city has been set up in ___was a wasteland ten years ago.为什么填what ,where呢?

A modern city has been set up in ___was a wasteland ten years ago.为什么填what ,where呢?
A modern city has been set up in ___was a wasteland ten years ago.为什么填what ,where呢?

A modern city has been set up in ___was a wasteland ten years ago.为什么填what ,where呢?
what后面引导的是一个定语从句,what既是后面从句的主语,还是前面主句的宾语,where作为一个副词是不能做主语和宾语成分的.

what 做主语