He always helps his students ,_____ he is verybusy.A but B although C for D so

问题描述:

He always helps his students ,_____ he is verybusy.A but B although C for D so

D
表因果关系
请在客户端右上角评价点“满意”即可,为什么不能用although可以, 题目没出好, 不严谨! 不过如果用although, always 最好改为still