I had an English test this morning and after my teacher graded it I was surprised that I had this question wrong. I filled the blank with were discussing and I know that for a fact that sounds, at least to me, correct. I was very surprised to find out that my teacher deducted points for that. I understand why you can put discussed there but her explanation to why she marked my sentence as wrong was something along the lines of "unproperly used grammar" . I am on the border between an excellent and a good mark and it depends only on that sentence. Can you please tell me if what I filled is right, cause to be honest I am not sure.
Any help will be greatly appreciated! Have a good one!