--- The patient looks much better. _____is it that has made him _____he is today?
--- Perhaps the special medicine and his family’s patient care.
| A．What; that | B．That; that | C．What; what | D．What; which |
Only when David did it a second time _________.
| A．he realized his mistake |
| B．he was realizing his mistake |
| C．did he realize his mistake |
| D．he did realize his mistake |
So instructive _________ that the student wanted to see it again.
A. was the film B. it was the film
C, the film was D. the film it was
Not until I went to America _________ what kind of country it was.
| A．did I know | B．I did know |
| C．I didn't know | D．I could know |
_________ forget my hometown and my happy childhood.
| A．Never I will | B．Never will 1 |
| C．Never I | D．I never have |
_________ she would have avoided the accident.
| A．She was more careful | B．If she was more careful |
| C．Had she been more careful | D．She had been more careful |