He is diligent pupil but she is diligent of all.A. the most…the mostB. the most…a mostC

问题补充：

He is diligent pupil, but she is diligent of all.

A. the most…the most

B. the most…a most

C. a most..the most

D. a most..a most

答案：

A. the most…the most

B. the most…a most

(答案→)C. a most..the most

D. a most..a most

解析：第一空表示一般概念，第二空表示最高级。