They are not ( ) for their study.选择那个对?A.bad b.well c.good

问题描述:

They are not ( ) for their study.选择那个对?A.bad b.well c.good

如果没有上下文,A与C都对
A
对……有害
他们对学习没有害.
C 对……有益
他们对学习没有益