Every possible means ____, but none ____ successful.A.has tried; has provedB.tried; provesC.has been

题目简介

Every possible means ____, but none ____ successful.A.has tried; has provedB.tried; provesC.has been

题目详情


Every possible means ____, but none ____ successful.
A.has tried; has provedB.tried; proves
C.has been tried; provesD.is being tried; is proved
题型:单选题难度:偏易来源:不详

答案

C

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