Both are possible. Only 'just' indicates that the coming was very recent, perhaps only seconds ago.
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Ireneusz Patalas I'd like to hear it from a native (no offence of course)Well, I have been a native speaker for over sixty years.
Ireneusz PatalasIf it's the latter one then it makes no sense to put such sentence in an English quiz and require only one correct answer when both are and none of them is "more correct" than the other, right?Right! if there are no other clues that would tip the balance to one or the other, they're both equally acceptable.