He hasn\'t been successful in his study,but he---hard.

A really works B do works C do work D does work

热心网友

选择A, do+V 用于强调什么，一般不用于表述，更多用于单句。而A项是说实际情况，用REALLY没错！

热心网友

选A,在肯定句中不能does work,所以排除D

热心网友

He hasn\\\'t been successful in his study,but he works really hard.侧重点不同吧

热心网友

I\'d choose (D) but cannot see why (A) is wrong.