He brushes his teeth twice a day .用twice提问

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He brushes his teeth twice a day .用twice提问

He brushes his teeth twice a day .用twice提问
He brushes his teeth twice a day .用twice提问

He brushes his teeth twice a day .用twice提问
How many times does he brush his teeth every day?

how often does he brush his teeth?
how many times does he brush his teeth a day?