Teachers in every discipline assigned books to their students and used paper to keep track of which student had which book.
请问"which student had which book"是什么语法成分？
你根据全句的逻辑作判断。如果which为关系代词，指代先行词，就是定语从句。如果which为疑问词，就是名词性从句。这个问题还是你自己解决吧。要结合整个句义。
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