8 класс. Английский язык. Контроль знаний. Complex Object. Сложное дополнение

Учи­тель на­блю­дал, как уче­ни­ки де­ла­ли упраж­не­ние.

• The teacher watched the pupils doing the exercise.
• The teacher watched the pupils did the exercise.
• The teacher watched the pupils to do the exercise.