8. It --- heavily while the tourists --- around the ancient site. a. was raining – walked; b. rained – were walking; c. rained – walked; d. was raining – were walking

Перевод задания: Выберите правильный вариант.

d. was raining – were walking. It was raining heavily while the tourists were walking around the ancient site. (Сильно шёл дождь, пока туристы гуляли по территории древнего памятника.)

Дождь и прогулка одновременно продолжались, поэтому для обоих действий используется Past Continuous.