Choose the correct answer

7. This school _____ ten years ago.

A. be built

B. is built

C. was built

D. built

8. He _____ since the day we left school.

A. hasn't seen

B. hasn't been

C. wasn't seen

D. hasn't been seen

9. We spent half a year _____ this hotel.

A. to build

B. built

C. building

D. with building