如果你只去过某地一次，你可以说once /一次：例如：I ‘vebeentoShanghai once /我只去过上海一次。
If you have been somewhere only one time, you say once /once: e.g.; I’ve been to Shanghai once / I ‘ve been to Shanghai once.
如果你只去过某地一次，你可以说once /一次：例如：I ‘vebeentoShanghai once /我只去过上海一次。
If you have been somewhere only one time, you say once /once: e.g.; I’ve been to Shanghai once / I ‘ve been to Shanghai once.
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