How to get entry of a google form

问题

I am trying to create a bot that will auto-fill a form I am writing in c# and I have used the following Github code to do so. My problem is, that in order to fill a field in the form I need something that is called entery. But I don't know what it is, or how can I get it. I have access to the form, I have tried to inspect a field in the form in order to get the ID, but I can't find it. what is an entry, and how can I find it?

example:

submissionService.SetCheckboxValues("entry.55555" /*what should "entry.55555" be?*/, "value");

来源：https://stackoverflow.com/questions/59763158/how-to-get-entry-of-a-google-form