33. A

34. D

35. C

36. A

37. D

38. C

39. B

40. B

41. D

42. A

43. D

44. C

45. A

46. A

47. C

48. A

49. B

50. D

33. A. did you do ⇒ were you doing

34. D. has already left ⇒ had already left

35. C. during ⇒ when

36. A. has disappeared ⇒ disappeared

dấu hiệu nhận biết: three days ago -> thì quá khứ đơn: S + V_ed

37. D. was cooking ⇒ cooked

38. C. saw ⇒ have ever seen

This is the first time + S + have/has + Vp2: Lần đầu làm gì.

39. B. graduates ⇒ had graduated

Khi hai hành động cùng xảy ra trong quá khứ, ta dùng thì quá khứ hoàn thành cho hành động xảy ra trước và quá khứ đơn cho hành động xảy ra sau.

40. B. had been ⇒ has been

41. D. They haven't visited me for five years.

42. A. Before Mike went to bed, he had turned off the light.

43. D. It is three months since I visited the muscum.

44. C. John has played the piano for 10 years.

45. A. I haven't seen her for a week.

46. A. It's a month since my father last smoked cigarettes.

47. C. Mr. Brown has had this car for five years.

48. A. It's years since I enjoyed myself so much.

49. B. We haven't been to the cinema for a long time.

50. D. I haven't seen Rose for three years.