You can go in and submit this quiz on your student’s behalf (Brightspace has a feature for this exact purpose). Below are step by step instructions:
Go to Assessments-> Quizzes .
Click the drop down arrow next to your selected Quiz and choose Grade
This will show your whole class. You may wish to filter you class list.
Click Show Search Options to access the menu shown here.
In the Restrict to dropdown menu, select “Users with attempts in progress”.
Click on the search icon (magnifier glass in the “Search For” field).
At the student’s quiz attempt:
Click on the Enter Quiz as User icon.
In the confirmation window, select Yes.
Scroll all the way to the bottom of the page, and click Submit quiz.