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。