Ask the students who brought their books to class to follow along. Either will work; common sense tells us that (1) they don't all share the same book and (2) only one book each is required for following along.
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AnonymousShould it rather be ....Ask the students who brought their books to class to follow along.Either will work; common sense tells us that (1) they don't all share the same book and (2) only one book each is required for following along.