Choose the correct answer
14. B. Thank you. It's really encouraging
15. D. I can't agree more (hoàn toàn đồng ý)
16. a. had won/ would be
=> Mixed conditionals
17. a. unless
=> unless = if not
18. b. The/ the
19. c. had she written
=> cấu trúc inversion
20. C. would be
=> Câu đk loại 2
21. B. hence (vì vậy)
22. D. has known (for a long time: dấu hiệu thì Hiện tại hoàn thành)
23. A. It was such complicated problem that the students couldn't understand
