摘要： Every possible means , but none proves successful. A. has tried B. has been tried C. have been tried D. tried
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Every possible means______,but none proves successful.
A.has been tried B.tried C.is being tried D.has tried
Every possible means______,but none proves successful.
A.has been tried B.tried C.is being tried D.has tried
Every possible means ____, but none ____ successful．
A. has tried; has proved B. tried; proves
C. has been tried; proves D. is being tried; is proved
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