You can see a longitudinal view of your survey results using Series Analysis
The table shows
a row for every respondent (contact saved in your CRM)
a group of columns for every question in the survey - specifically a column for each time that the survey has been completed by a contact
Open the left Sidebar
Select Impact
Select Surveys
Select the survey you have in mind
Choose the Survey Campaign (project)
You arrive on the Survey Campaign page
Select Series Analysis