Also, another way is to just treat the quotation as something else, and not even include punctuation. At least this way it would be clear that the statement in the quotations is not a question. This looks much better to me:
Did you know John Adams died shortly after uttering his last words, "Thomas Jefferson survives"?
See? John Adams didn't ask if Jefferson was alive. I'M asking if you know that he did in fact say this. My way demonstrates that better than the current method.
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