I think it is fine. It could be both meaning, the japanese language doesn't use all those different tense of a verb.
It is past form so "where have you been?" or "Where were you?" are fine as both are past tense.
Then, that would depend on the context.

with a space before the "?" :)

Well, in japanese, the "?" is optional anyway ^_^

I mean it's "passé ?" not "passé?" (as you own the French sentences)

oooh! sorry for the misunderstanding!
Well, I'm not sure there's a rule for that but I'll change it anyway ^_^

In fact to be really precise it should be a non breakable space
and there's rule for that
If you sepak French => http://www.dsi.univ-paris5.fr/typo.html at the end you have rule for punctuation :)

Oh I see. But it is in fact typographic rules, not grammar rules so you can apply it or not.
Maybe that exists also in grammar but I don't remember those ...

Anyways, you're right that we should follow those rules.

The main reason is too detect easier duplicate sentences :)

I see ^_^
I'll be more careful from now on! ^_^