5. I did not recognize Helen as I (not to see) her for a very long time and she greatly (to change).

Ответ (EN)

• 5. I did not recognize Helen as I had not seen her for a very long time and she greatly had changed.

Перевод (RU)

• 5. Я не узнал Хелен, так как не видел её очень долгое время, и она сильно изменилась.