英语一道选择题理由·哦

问题描述:

英语一道选择题理由·哦
Every means____tried but without any result.
A.have been B.is to be C.are to be D.has been

选D,means是方法的意思,单复数同形,every means是每种方法,每种方法都被试过了,但都无结果.