Both "who" questions are correct. There is a small difference in meaning. "at" means that you are "at" or "in" the library building but you could also use "to". "To" is used when you are actually on your way to the library to return your books. You would not use "at" if you were on your way to the library.
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Why," Who is returning books at the library," I ask, "Who is returning books to the library,"
Both "who" questions are correct. There is a small difference in meaning. "at" means that you are "at" or "in" the library building but you could also use "to". "To" is used when you are actually on your way to the library to return your books. You would not use "at" if you were on your way to the library.
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