79 points in two exams, but the teacher thinks he has made progress.

When we feel misunderstood by the teacher, we should take the initiative to communicate with the teacher. Of course, communication needs the right method. The correct way to solve the problem is to communicate with the teacher sincerely. D is correct, and options A, B and C are all wrong, which will lead to contradictions and even conflicts with teachers, damage the feelings with teachers, and is not conducive to the establishment of a harmonious teacher-student relationship. So choose D.