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Everymeans,butnoneproved.A.havetried;asuccessB.havebeentried;successfulC.hastried;tobesuccessfulD.hasbeentried;successful

题目详情
Every means     , but none proved      .
A.have tried; a success
B.have been tried; successful
C.has tried; to be successful
D.has been tried; successful
           



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D
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