Quiz Marking - canvas makes you redo correct answers

[amy18]

Most of our assessments are made up of multiple choice type questions, which are auto marked. If a student gets them wrong in canvas, they have to do EVERY single question again regardless of whether they go it right or wrong.

Has anyone worked out how to fix this to hide correct answers to avoid duplication of assessment and stop wasting our student's time? 

I'm thinking I will have to cancel canvas if his can't be fixed.