Although the causes of cancer , we do not yet have any practical way to
题型:同步题难度:来源:
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
A |
举一反三
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 |
— What is that noise? — Oh, I forgot to tell you that the new machine_____ . |
[ ] |
A. was tested B. will be tested C. has been tested D. is being tested |
It is reported that many a new house at present in the disaster area. |
[ ] |
A. are being built B. were being built C. was being built D. is being built |
—Hi, Tom, can I use your computer for a while this afternoon? —Sorry. ________. |
[ ] |
A. It"s repaired B. It"s being repaired C. It has been repaired D. It had been repaired |
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 |
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