It is no longer what it was 20 years ago中的what做表语从句的什么成分 为什么

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It is no longer what it was 20 years ago中的what做表语从句的什么成分 为什么

what做表语从句的(was的)表语,what引导的从句做is的表语

主语
可以这么看:
从句原来的顺序是what was it 可以看出what做主语
表语从句中从句用陈述句语序,所以what was it变为what it was