I like this book bought in shanghai 定语, which is cheap.
I bought this book in Shanghai状语, which is cheap.(为什么跳状语不行)
我印象里没有听说过这种说法。要看具体句子判定。你的两个句子在口语里都有可能使用,也不会产生歧义,没有人会认为which is cheap 会修饰上海。比较简练的说法是不用定语从句:I like this book bought cheap in Shanghai. I bought this book cheap in Shanghai.
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