Every means tried but without much result.A. has beenB. have beenC. areD. is

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(答案→)A. has been
B. have been
C. are
D. is
解析： 考查主谓一致。Means，方式，方法，是单复数同形的词，谓语动词的单复数要根据means的单复数确定；因为是Every means，每种方式，所以谓语动词用单数；且根据句意，每种方式已被试过，但没有多大效果。所以用现在完成时态。选A。