Every means _but without much result.A.have been tried B.has been tried C.have tried D has tried.

问题描述:

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.请问,为什么不选,has tried.每种方法已经被尝试,所以要用现在完成时的被动。