Every possible means to save the future of the baseball player so far.A. was triedB. were

问题补充：

Every possible means to save the future of the baseball player so far.

A. was tried

B. were tried

C. have been tried

D. has been tried

答案：

A. was tried

B. were tried

C. have been tried

(答案→)D. has been tried

解析：考查主谓一致：means是单复数同形的名词，单复数要看修饰means的单词，这题是every修饰的，所以是单数谓语，时间是so far用现在完成时，means和try是被动关系，用现在完成时的被动式，句意：到现在为止每个可能的方式已经被尝试来拯救棒球明星的未来。选D。