1. When Mark opened the door, he saw a woman standing there. He ________ her before.
A. never saw B. had never seen C. never sees D. has never seen
2. After a fire broke out in the lab, a lot of equipment ________ .
A. is damaged B. had damaged C. damaged D. was damaged
3. It is almost five years ________ we saw each other last time.
A. before B. since C. after D. when
4. He never said that he was good at mathematics, ________ ?
A. was he B. wasn’t he C. did he D. didn’t he
