定语从句还是宾语从句？

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？

你依据全句的逻辑作判断。假如which为关系代词，指代先行词，就是定语从句。假如which为疑问词，就是名词性从句。这个问题还是你一个人解决吧。要结合整个句义。