Every possible means ___.was tried has been tried.为什么不能选 Was

Every possible means ___.was tried has been tried.为什么不能选 Was every possible means_____.A.has tried B.has been tried C.was every means has been tried.Yet this machine ___ Every means has been tried since all possible means has been tried,but has any effect. 英语翻译还有Every means has been tried since then. Every means was tried but no one worked 怎么翻译? More than one means has been tried. All possible means have been tried to ()the flu. Every possible ________ has been tried to help those less de 改写句子Every means has been tried,yet this machine won't work. Every means _but without much result.A.have been tried B.has