"No, finché non lo apri."
This sentence is too advanced for this level. We need a pronoun subject (including words like "lo") before this level.
It sounds like the "i" in "apri" is accented (i.e., "aprí"). This should be corrected.
My answer was "No, as long as you do not open it" and was marked wrong even though "as long as" was given as one of the meanings of "finche." Not cool! I did report it as a mistake but wonder if that's happened to anybody else.
I am sure that we had "No, non finche non lo apri" previously meaning the same thing? There were many comments but I can't go back to look
Edit Yes we did. My grammar book say that 'finche' is normally followed by 'non' when the sense is "until something happens" (er ... when is 'until' not used like that?').