I have been to Sydney once (对划线部分提问,划得是once) ( )( )( )have you been to Beijing?

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IhavebeentoSydneyonce(对划线部分提问,划得是once)()()()haveyoubeentoBeijing?IhavebeentoSydneyonce(对划线部分提问,划得是on

I have been to Sydney once (对划线部分提问,划得是once) ( )( )( )have you been to Beijing?
I have been to Sydney once (对划线部分提问,划得是once) ( )( )( )have you been to Beijing?

I have been to Sydney once (对划线部分提问,划得是once) ( )( )( )have you been to Beijing?
How many times