Giải đúng cấu trúc của lớp 9 giúp em ạ

47.1 haven't been to a concert for over a year. The last time 48. The last time I really enjoyed myself was your birthday party. I haven't 49. It's nearly 20 years since my father saw his brother. My father hasn't 50. When did you learn to drive? How long is it 51.The last time I went ...