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?

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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?

表明这类交通工具的总称,用单数