3.She understood the company’s problems because she (worked/had been working) there since it started. 4.She was upset because (she lost/had lost) her umbrella.
Ответ:
3. had been working
4. had lost
Объяснение:
Я извиняюсь, не могли бы вы объяснить мне? Мое почтение.
А что объяснить?