i had opened the box 和 i have opened the boxi had opened the box 和 i have opened the box 什么区别 分别啥意思 had 和 have 怎么用 英语
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【答案】 had opened the box 此句用的是“过去完成时,是相对过去来说的.
如：I told (过去）him that I had opened(过去的过去） the box.
i have opened the box 用的是现在完成时,强调对现在的影响