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Đáp án D
Giải thích: never…before: chưa từng…trước đây là trạng từ của thời hiện tại hoàn thành
Dịch: Chúng tôi chưa từng xem thí nghiệm vật lý này trước đây.
1. It is two years since she left university.
2. Laurence last saw her sister when she left for Japan.
3. The last time Lucky wore that dress was at Barbara's wedding
4. My mother has worked at this school for 25 years.
5. This is the first time I have been to this entertainment park.
6. The last time I heard from him was in August.
8. I have not played football since 1970.
9. We last saw Tom when he moved to Bristol.
10. Bob has not visited Vietnam before.
Mk tưởng câu 1 phải là "It has been two years since she left university" chứ nhỉ 
Rewrite the second sentence in such a way that it has the same meaning as the one before it:
1, I have never read such a romatic story
This is the first time I have read such a romatic story
2, We started cooking for the party four hours ago
We have started cooking for the party for four hours
3, How long is it since they bought the house ?
When did they buy the house
4, She hasn't been to the hairdresser for three months
It's three months since she last went to the hairdresser
5, I've never met such as famous person before
It's the first time I've met such as famous person
6, They last visited me five years ago
They haven't visited me for five years
1, I have never read such a romatic story
-> This is the first time I have ever read such a romatic story
2, We started cooking for the party four hours ago
-> We have cooked for the party for four hours
3, How long is it since they bought the house ?
-> When did they buy the house ?
4, She hasn't been to the hairdresser for three months
-> It's three months since she last went to the hairdresser.5, I've never met such as famous person before
-> It's the first time I've ever met such as famous person
6, They last visited me five years ago
-> They haven't visited me for five years
Đáp án: B
Giải thích: Câu chia ở hiện tại hoàn thành “have/ has + pII”
Dịch: Tôi chưa từng đến thác nước nào đẹp hơn cái này
Đáp án: B
Giải thích: chuyển đổi giữa câu so sánh hơn và so sánh nhất
“this is the most adj + N + S have/ has + ever + P2” <=> “S + have/ has + not/ never + P2 + a more adj than this”
Dịch: Đây là buổi trình diễn tuyệt vời nhất mà tôi từng xem.
1. I had bought this pen before I went to bed last night
=> This pen had been bought before I went to bed last night.
2. Nina had washed the dishes
=> The dishes had been washed by Nina.
3. I had written a report
=> A report had been written.
4. Sam had done his exercise by noon
=> Sam's exercise had been done by noon.
5. They had not finished the report before they had a test
=> The report hadn't been finished before they had a test.
6. We had seen this movie before Nina called
=> This movie had been seen before Nina called.
7. After I had cleaned the house, I went to school
=> After the house had been cleaned, I went to school.
8. After Mark had washed his clothes, he studied
=> After Mark's clothes had been washed, he studied.
9. Vicky had ironed the clothes by noon
=> Vicky's clothes had been ironed by noon.
10. I hadn't brushed my teeth before I went to bed last night
=> My teeth hadn't been brushed before I went to bed last night.
Đáp án B
Giải thích: chuyển đổi giữa câu so sánh hơn và so sánh nhất
“this is the most adj + N + S have/ has + ever + P2” ⇔ “S + have/ has + not/ never + P2 + a more adj than this”
Dịch: Đây là buổi trình diễn tuyệt vời nhất mà tôi từng xem.
Đáp án: D
Giải thích: never…before: chưa từng…trước đây là trạng từ của thời hiện tại hoàn thành
Dịch: Chúng tôi chưa từng xem thí nghiệm vật lý này trước đây