It's the same as the difference between any present perfect and past perfect constructions. With the past perfect, the time period in which the visiting took place ended at some past time. With the present perfect, the time period extends up to the moment of speaking.
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fivejedjonIt's the same as the difference between any present perfect and past perfect constructions.With the past perfect, the time period in which the visiting took place ended at some past time. With the present perfect, the time period extends up to the moment of speaking.Thank you very much!