Exercise 3: Choose the best answer.
1. It was not until midnight ______________back home.
A. did John come B. had John come C. that John had come D. that John came
2. It was not until 1994 that this school______________
A. builds B. built C. had built D. was built
3. It was not until 2000 that I ______________ him
A. teach B. teaching C. to teach D. taught
4. It _________________ until his father came that he ate something.
A. was B. were C. was not D. were not