Прочитайте текст. Выберите один из предложенных вариантов ответа. Заполните пропуск (A3).
Déjà vu is the feeling of having had exactly the same experience at some unknown time in the past. I (A1) ... in the same college for many years, but I remember one occasion in particular when I had this feeling.
A few years ago I (A2) ... a lesson of Physics to a student in an upstairs lecture room where I (A3) ... before. I reached the part of the lesson where we began discussing radioactivity when I (A4) ... (захлестнуть) by a feeling of déjavu. I knew I was about to refer to a book in my office. I also knew that on a previous occasion I (A5) ... to collect it from the office too. I (A6) ... to my student and asked him if we had discussed the topic already. He looked puzzled and replied that we (A7) ... anything like that before. However, my awareness of the experience didn't make the déjà vu feeling go away, even when I tried not to repeat the pre-set pattern.
2) have never been taught
3) had never taught
4) was never teaching
Есть маркер группы времен Perfect, слово before. Действие происходит в прошлом. Этого достаточно, чтобы выбрать ответ had never taught, форму в Past Perfect, прошедшем совершенном времени. По контексту понятно, что действие, обозначенное пропущенным глаголом, происходило ДО другого действия в прошлом, ранее.
Правильный ответ указан под номером 3.