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Everypossiblemeans,butnonesuccessful.A.hastried;hasprovedB.tried;provesC.hasbeentried;provesD.isbeingtried;isproved

题目详情
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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答案和解析
答案:C翻译:每一种可能的方式都(已经)被尝试了,但是没有一个结果是成功的.解释:1. means是可数名词,但是其单复数形式同形(都是means).题中的every表明前句主语为单数,所以其谓语动词也用单数形式,且其和动词t...