Task 2. Choose the correct option. 1. By the time the guests arrived, we ___ for three hours. a) had been cooking b) have been cooking c) had cooked 2. I ___ her for ten years. a) have known b) have been knowing c) knew 3. She ___ the report by 5 pm yesterday. a) had finished b) has finished c) had been finishing 4. Why are you so dirty? — I ___ in the garden. a) have worked b) have been working c) had been working 5. He ___ for the bus for 20 minutes when it finally came. a) had been waiting b) has been waiting c) waited

1. a) had been cooking — действие длилось до момента в прошлом.
2. a) have known — глагол know обычно не употребляется в Continuous.
3. a) had finished — действие завершилось до указанного момента в прошлом.
4. b) have been working — действие недавно продолжалось и объясняет результат.
5. a) had been waiting — длительное действие происходило до другого действия в прошлом.

Ответ: 1 — a, 2 — a, 3 — a, 4 — b, 5 — a.