He is clever and also works______,so he can work out such a ___math problem

问题描述:

He is clever and also works______,so he can work out such a ___math problem
A hard ,hardly B hardly,hard C hard ,hard D hardly,hardly

C
hard这个词比较特殊,既可以用作副词,又可以用作形容词.
第一空,hard作副词 “努力地”,修饰动词works;第二空hard作形容词,“难的”修饰名词problem