改病句In the past,the travelling in Shanghai were buse.were buse错了,应该为什么?
问题描述：
改病句In the past,the travelling in Shanghai were buse.were buse错了,应该为什么?
改病句Nowadays,the travelling in Shanghai is buses,taxis,undergrounds.
buses,taxis,undergrounds错了,应该为什么?
答
表明这类交通工具的总称,用单数两句都是吗？travelling 表示交通方式，不可数的，应该用was