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Everypossiblemeans,butnoneprovessuccessful.A.hasbeentriedB.havebeentried-----------------------
题目详情
Every possible means ____,but none proves successful.
A.has been tried B.have been tried
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A.has been tried B.have been tried
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▼优质解答
答案和解析
A.has been
主谓一致
every 修饰的名词用单数
主谓一致
every 修饰的名词用单数
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