Đáp án:
1. They have built the bridge for 5 months
2. I have visited my uncle for 3 months
3. This is the first time Mai has been in such a beautiful hotel.
4. The last time Mr. Brown wrote an English report was 3 months ago.
Giải thích các bước giải:
1. No 1
2. No 2
3. No 3
4. No 4