11. Mr. Black told the policeman what happened, _______ the whole process of the accident.

　A. witnessed　　 B. to have witnessed　　 C. witnessing　　 D. having witnessed

10. Mr. Black happened to be on the spot, _______ the whole process of the accident.

9. _______ many times, he still couldn’t understand it.

　A. Having been told　　 B. Having told　　 C. He had been told　　 D. He told

8. _______ many times, but he still couldn’t understand it.

7. I ________ as a teacher for 10 years; but now I am a taxi driver.

　 A. have worked　　 B. have been working　　　 C. worked　　 D. am working

6. Don’t have the dog ______. Protect it.

　 A. killing　　　 B. killed　　 C. kill　　 D. to kill

5. Don’t have the dog ______ the chicken. Protect them.

4. He was so fat ______ he couldn’t get through the door.

A. that　　 B. which　　 C. when　　 D. where

3. Nancy enjoyed herself so much _______ she visited her friends in Sydney last year.

2.　　　 It was in 2005 ________ he finished his study and returned to his motherland.

A. when　　　 B. since　　　 C. that　　　 D. before