5. When Tina --- at the museum, Helen --- for her at the gate. a. arrived – waited; b. was arriving – was waiting; c. arrived – was waiting; d. was arriving – waited

Перевод задания: Выберите правильные варианты.

c. arrived – was waiting. When Tina arrived at the museum, Helen was waiting for her at the gate. (Когда Тина приехала в музей, Хелен ждала её у ворот.)

Прибытие — завершённое событие (Past Simple); ожидание уже продолжалось в тот момент (Past Continuous).