First, let me apologize for the late reply. We had a problem with the forum for over a month that prevented thread notifications from being mailed to our support staff and we just found about it this week.
There is no built-in query string parameter that controls which page of the survey you land on, however there is built-in functionality to let you add this to your survey.
Checkbox supports "Hidden Items" that can read abitrary query string values from the URL. You can then add branching logic to direct users to specific pages based on the captured values.
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