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

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

A. works hard atB. work hardly at(答案→)C. work hard atD. 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。

我好好复习下