Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.选哪个,为什么?

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Everymeans_butwithoutmuchresult.A.havebeentriedB.hasbeentriedC.havetriedDhastried.选哪个,为什么?Everymeans

Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.选哪个,为什么?
Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.
选哪个,为什么?

Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.选哪个,为什么?
B means 是一个单复数同形的词.Every means 每一个方法,所以用单数.而且是已经被尝试.所以用被动.

B
每种手段(方法)都已经尝试了但是没有效果。
单数