13. Although the cause of cancer _____, we do not yet have any practical way to prevent it.

A. are being uncovered　 　B. have been uncovering

C. are uncovering　　　　 D. have uncovered

将来时的被动语态　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　 3

12. –I don’t suppose the police know who did it.

　 --Well, surprising they do. A man has been arrested and _____ now.

A. has been questioned　　 B. is being questioned

C. is questioning　　　　 D. has questioned

11. I have to go to work by taxi because my car _____ at the garage.

A. will be repaired　 B. is repaired　 C. is being repaired　 D. has been repaired

10. With more forests being destroyed, huge quantities of good earth _____ each year.

A. is washing away　　　 B. is being washed away　　

C. are washing away　　 D. are being washed away

9. --Can we move into our new house now?

　 --No, because it _____.

A. is painted　　 B. is being painted　　 C. has been painted　　 D. is painting

8. Much progress _____ in science and technology in China.

A. is making　　 B. has made　　 C. is being made　　 D. is made

7. Some courses _____ in English in many universities..

A. are being taught　　 B. are teaching　　 has taught　　 D. have been taught

6. Many new functions _____ to cellphones nowadays.

A. have added　　 B. are adding　　 C. were added　　 D. are being added

5. A new library _____ in our school.

A. is building　　 B. is built　　 C. have built　　 D. is being built

4. Cellphones _____ by more and more teens.

A. are using　　 B. is used　 C. are being used　　 D. being used