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

问题补充：

Every means tried but without much result.

A. has been

B. have been

C. are

D. is

答案：

(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。