3. Choose the correct tense forms. When the teacher ... the door, the pupils ... at the desks. A) will open, will sit B) opened, were sitting C) has opened, will sit D) had opened, sat E) has opened, were sitting

Перевод задания: Выберите правильные формы глаголов. Когда учитель ... дверь, ученики ... за партами.

B) opened, were sitting — Past Simple обозначает краткое действие, на фоне которого происходило длительное действие в Past Continuous.

When the teacher opened the door, the pupils were sitting at the desks. (Когда учитель открыл дверь, ученики сидели за партами.)