Прочитайте предложения. Укажите номер подчеркнутого фрагмента, в котором допущена ошибка. A7. Last week, I was looking through (1) some boxes at my parents' house (2) and I found some old letters that my dad had written to my mum (3) when he was in his early twentieth (4), before they got married (5).​

Фрагмент (4) содержит ошибку. Вместо "early twentieth" должно быть "early twenties".