What's the meaning of "ever" in this sentence
"Did you ever read the book?" What's the meaning of "ever" in this sentence, please? Thanks!

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Ever here is 'at any time'.  It's similar to 过 I think.
I think that it would usually be used to express a doubt about whether someone had really read it.

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Yes, Gary is right. It means, "Have you at any time read that book?" Implying that you most likely have not. It is a negative connotation.

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I think it means " did you even try to read the book? "