Every possible means .A. has triedB. has been triedC. was triedD. were tried

问题补充：

Every possible means .

A. has tried

B. has been tried

C. was tried

D. were tried

答案：

A. has tried

(答案→)B. has been tried

C. was tried

D. were tried

解析：考查主谓一致和非谓语动词。句意“每种可能的方法都被试过了。”means和try是动宾关系，应该用被动语态；排除A、C、D。故选B。