ПОМОГИТЕ. Задайте общий вопрос к предложению: John was talking to his sister when I saw him.

Выберите один ответ:

a.
Was John talking to his sister when I saw him?


b.
Was John talk to his sister when I saw him?


c.
Were John talking to his sister when I saw him?


d.
Did John talk to his sister when I saw him?