why I can not see the quiz correct answers?
Hi Leila Ebrahimi Welcome to thew Canvas Community!
I strongly suspect you are asking this as a student, but please correct me if I am wrong.
You cannot see the correct answers on your quiz, because your teacher has not set the quiz to display correct answers. I would suggest contacting your teacher for this. You can learn how at How do I send a message to a user in a course in the Inbox as a student?
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