How do you do?为什么它的答句也是How do you do?

How do you do?为什么它的答句也是How do you do? How do you do?的答句为什么可以是What do you do我说错了，答句为什么可以是How do you do 为什么How do you do?的回答居然还是How dO you dO? How are you do 的中文,为什么加Do.How are you do 的中文,为什么加Do. 外国人为什么说 how do you do how are you doing?为什么do要加ing?而How do you do的do就不需要? How do you do? How Do You Do? how do you do? how do you do How do you do how do you do How do you do How do you do? 的答句是什么 How do you do的答句是什么 how do you do的同义句 How do you do.的中文意思 How do you do?的中文