要看具体情况
I have seen it是现在完成时
I had seen it是过去完成时
在使用过去完成时时 一般会与过去时连用
例如 She went school after she had finished her breakfast.
在使用现在完成时时 一般回有一段时间或几次
例如 She has watched this film twice.
I have seen it与I had seen it
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