On Extempore, when a "Limit Time to Review" is added to a question, the question becomes a "Single-Attempt" question.
If a student opens a single-attempt question and does not submit a response (due to refreshing the page, closing the browser, backing out or losing internet, etc.) the student will be locked out of the question.
This is helpful for two reasons:
You know the student opened the question and viewed the contents.
Students cannot navigate back to the page after looking up an answer and try again.
Instructors can always unlock attempts and allow students to attempt the question again.