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

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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 did the boy go up and down the stairs?

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

How did the boy go up and down the stairs?

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