Her father once went to Hong Kong.=Her father__ __ __ to Hong Kong.

Her father once went to Hong Kong.=Her father__ __ __ to Hong Kong.
Her father once went to Hong Kong.=Her father__ __ __ to Hong Kong.

Her father once went to Hong Kong.=Her father__ __ __ to Hong Kong.
used to go
曾经去过

ever went to

填 has been to
once went to 是“曾经去过某地”的意思。用has once been代替它.

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has ever been , 意思是她爸爸曾经去过香港，这事已经是完成的了，同义句就得用完成时表达。所以我会用has ever been to HK。希望能帮到你。