ответ: have been expecting
Finally she answered. I have been expecting her for so long.
Перевод: (Наконец она ответила. Я так долго ждал ее.)
Объяснение: Смотри здесь всё просто:
Первое предложение у тебя говорит о том, что действие уже завершенно (то есть результат) Значит можем говорить о том, что это
Настоящее завершённое длительное используется только в том случае, если действие совершается в данным момент времени. ("Маячники" по которым можно распознать это время: since и for, здесь их у тебя нет) Формула: have\has +been +Ving
Настоящее завершённое(Present Perfect). Формула: have\has +V3
The Browns were playing a board game when the telephone rang.
The boys were making a present for their father when he came home.
Mr. Starry was driving a car when he heard the news about an accident on the road.
They were watching a film when the lights went off.
Ala and Tina were choosing clothes for their babies when the shop assistant came.
They were making a snowman when it started to snow.
The men were fishing when they saw a Loch Ness monster.
The children rode the bikes in the park yesterday afternoon.
The Smiths were shopping when they met their neighbours.
I entered the room when my boss was talking to the director.