改写句子Every means has been tried,yet this machine won't work.

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• 改写句子Every means has been tried,yet this machine won't work.Every means has been tried,yet this machine won't work.句子可以写成：-Every means tried,yet this machine won't work为什么可以省略has been
• 改写句子Every means has been tried,yet this machine won't work.
• every means has been tried.Yet this machine ___
• Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.
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