I asked you to change one for me ,which you did.请分析句子结构,这是主语

I asked you to change one for me ,which you did
我请你帮我换一个, 而且你也做了这件事.

which引导非限定定语从句, 指代I asked you to change one for me 这件事.


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再问： 如果是定语从句，它修饰什么？我觉得是宾语从句。
再答： which 就是指代 I asked you to change one for me 这件事.