Các câu ví dụ cho từ had

1. Last week, the vaccine had proven highly immunogenic when tested on 50 mice based on analyses of their serum samples.

2. The potential vaccine was first tested on 50 mice in May, though the project had commenced in February.

3. In it is a draft of a book on the history of Ho Chi Minh City he had written 22 years ago on an old typewriter, hoping to publish it when Saigon turned 300 years old in 1998.

4. After watching the process in silent awe, we had a quick breakfast and cleaned up the camp to begin our second day, heading to Phan Dung Mountain.

5. Beijing has long denied responsibility for the low water flows, and its foreign minister Wang Yi last year said that China had released more water on the request of Thailand, which was experiencing a drought.

6. In July, several carriers had suggested that the price ceilings be raised since fuel prices were higher than when the current ceilings were introduced in 2015.

7. Nguyen Viet Tien, deputy director of My Dinh Stadium, said the national sport complex had already finished upgrading its track and field facilities for an estimated of VND40 billion (nearly $1.

8. " A few months ago it had been a horror show as audiences refrained from going to public venues, and cinemas and studios suffered huge losses.

9. National Assembly Chairwoman Nguyen Thi Kim Ngan appealed for calm, saying the patriotism of people had been misused by certain extreme elements.

10. "Before he was confirmed positive for the novel coronavirus, "patient 1347," a 32-year-old Vietnamese man who lives in District 6, had visited a teacher of the Vo Van Tan School at a house she rents.