My brother always his lesson so he is a top student.A. works hard atB. work hardly atC.

问题补充：

My brother always his lesson, so he is a top student.

A. works hard at

B. work hardly at

C. work hard at

D. works hardly at

答案：

A. works hard at

B. work hardly at

(答案→)C. work hard at

D. works hardly at

解析：hard可用作形容词和副词，意思是努力的，坚硬的；hardly是副词，表示几乎不；句意：我的哥哥在学习上总是很努力，因此他是一个优秀学生。结合语境可知本句描述的是客观性的动作，故用一般现在时态。主语my brother表示单数第三人称含义，本句中hard用作副词，表示努力地。故选C。