Although he is very old,( )he works very hard 中能不能填but

问题描述:

Although he is very old,( )he works very hard 中能不能填but

不能,两者是虽然,但是的意思,但一句话里不可以同时出现
although……,……
……,but……
上面这句话也可以写成He is very old,but he works very hard .