every student aware of the importance of study they would study efficiently.A. WereB. Sh

问题补充：

every student aware of the importance of study, they would study efficiently.

A. Were

B. Should

C. May

D. Had

答案：

A. Were

(答案→)B. Should

C. May

D. Had

解析：考查省略及倒装，此题是表示与将来相反的虚拟语气，省略if，should 前提，正常语序为If every studen should aware of the importance of study，句意：如果每一个学生意识到学习的重要性，他们就会有效的学习。所以选B。