Currently, students can only review a quiz if they made an attempt. MDL-20329 logs the idea of doing something about that - but it is tricky becuse some questions have randomisation, so not all students would get the same questions.
If you want a work-around, then as teacher, preview the quiz, submit something (all blank answers?) then save the review of that attempt as a PDF file, and upload the PDF to the course (or something like that.)
If you want a work-around, then as teacher, preview the quiz, submit something (all blank answers?) then save the review of that attempt as a PDF file, and upload the PDF to the course (or something like that.)