Would "Cărțile din librărie" be wrong? Mulțumesc!
No. I think it's very unlikely someone would even say librăriei anyway.
Cărțile de la librărie sunt noi. This is correct. Please Duolingo change the answer!
I know that by this step we should use GenDat cases already. But I second that - is 'de la librărie' grammatically correct?