My uncle goes to the dentist's once a month.划线部分提问划线部分是once

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My uncle goes to the dentist's once a month.划线部分提问
划线部分是once

应该是:
How many time does your uncle go to the dentist's a month?
你叔叔一月去看牙医几次?
once 一次 ,对次数提问用how many times

How many times does your uncle go to the dentist's

How many times does your uncle go to see the dentist's a month?

How long does your uncle go to the dentist's?
你叔叔多久去看一次牙医?

你叔叔多久去看一次牙医