Every possible means but the teacher as well as the students found a solution to the pr

问题补充：

Every possible means , but the teacher as well as the students found a solution to the problem yet.

A. has been tried; hasn’t

B. has tried; haven’t

C. have tried; haven’t

D. have been tried; hasn’t

答案：

(答案→)A. has been tried; hasn’t

B. has tried; haven’t

C. have tried; haven’t

D. have been tried; hasn’t

解析：考查主谓一致。means单复同形，与every修饰，谓语动词用单数；as well as连接两个主语，谓语动词与前一个主语保持一致，故选A。