Indefinite pronouns are always tricky. For example, even though "everybody" refers to a lot of people it refers to them as a singular group. " But, the answer to your question, to the best of my knowledge is "have" is correct.
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ethan85I know, first sentence is correct if we add "Does" in the beginning so like:That's correct -- but in casual conversation, people are likely to omit the "Does."
Does anybody have any questions?