The boy went up and down the stairs three at a time.three at a time划线,对划线部分提问

问题描述:

The boy went up and down the stairs three at a time.three at a time划线,对划线部分提问

how often did the boy went up and down the stairs?
PS:我是来打酱油的。。。

How did the boy go up and down the stairs?

How did the boy go up and down the stairs?

How many did the boy go up and down the stairs ?