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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 
CONDITIONAL SENTENCES
I. Rewrite the following sentences, using an "if" construction.
1. The pupils will learn hard. They will pass the coming exams
If the pupils learn hard, they will pass the coming exams.
2. He doesn't take any exercise; that's why is so unhealthy.
If he took exercises , he wouldn't be unhealthy.
3. I didn't know your number so I didn't ring.
If i had known your number, I would have phoned.
4. I have no ladder so I can't get over the wall.
If I had a ladder, I could get over the wall.
5. My friends will have time. They will come visit me.
If my friends have time , they will come visit me.
6. We haven't got central heating, so the house is rather cold.
If we had got central heating , the house wouldn't be rather cold.
7. We don't go by air because We didn't have enough money.
If we had had enough money, we would go by air.
8. I am fat; that's why I can't get through the bathroom window.
If I wasn't fat, I could get through the bathroom window.
9. He wasn't looking where he was going. That's why he was run over.
If he hadn't been looking where he was going , he wouldn't have been run over.
10. The bus didn't stop because you didn't put your hand up.
If you had put your hand up, the bus would have stopped.
Bạn ơi, cho mình hỏi, ở câu 7 có phải have chuyển thành had không. Tại mình thấy có 2 từ had
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 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.