15. They have never eaten this fruit before
→ This
16. This last time Tom came back to his hometown was 5 years ago.
=> Tom has....
basketball
17. He started working as a teacher 6 months ago.
=> He has ...
18. It has been 3 years since we first went to Japan.
=> We have..
19. I last had my hair cut in June.
=> I haven't
20. The last time we met was 2 years ago.
=> We haven't...
Bài 6. Lu chon nhun
+