Thousands of what come to Changzhou on National Day every year.
把visitors 改为what就可以饿。。。对不起啊。。。看错题目了应该是用括号中所给单词的适当形式填空正好上面我也写出来了 visitors 游客（复数） ~~~~~~~~~~～～~~~~祝你进步，如对你有帮助，请及时采纳~~~~~~~~~~~~~~~~