He is one of the most excellent students in our class and he always himself in his stud

问题补充：

He is one of the most excellent students in our class, and he always himself in his studies.

A. buries

B. hides

C. covers

D. leaves

答案：

(答案→)A. buries

B. hides

C. covers

D. leaves

解析：考查动词辨析; A. buries埋葬，埋头B. hides躲避，C. covers覆盖，D. leaves离开，bury onself in （doing） sth,埋头于，句意是;他是我们班最优秀的学生，总是埋头学习。选A.