Although the causes of cancer ____, we do not yet have any practical way to prev
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Although the causes 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 |
答案
举一反三
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 |
— Have you handed in your schoolwork yet? — Yes, I have. I guess it _____ now. |
A. has graded B. is graded C. is being graded D. is grading |
— I don"t suppose the police know who did it. — Well, surprisingly they do. A man has been arrested and _____ now. |
A. has been questioned B. is being questioned C. is questioning D. has questioned |
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 |
— why don"t we choose that road to save time? — The bridge to it _____. |
[ ] |
A. has repaired B. is repaired C. is being repaired D. will be repaired |
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