This question already has an answer here:
When quoting one person in a (long) multi-paragraph monologue (shortened here), should the ending quotation marks for one paragraph be omitted if the next paragraph starts with an attribution tag? I have not been able to find an answer to this anywhere.
"Everyone has to have a flag. <--- Quotation marks here, or not?
After a moment he added, "They were the only ones left."