Directly Submitting Answers to Google Form using Google Apps Script
This is a sample script for directly submitting answers to Google Form using Google Apps Script.
The sample Google Form is as follows.
For this Google Form, this sample script submits the values of sample text, option2 and option1, option2, sample option to Google Form.
Sample script
For the multiple answers, it seems that it is required to send the values as the query parameter. I thought that the same key is used.