Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?
Yes,I had been to the U.S.once before.和 yes,I have been to the U.S.once 一个意思?
英语人气：938 ℃时间：2020-04-03 21:58:31
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第一句是过去完成时,表示到过去某个时间已完成的动作.用在这个场合不正确.第二句是现在完成时,表示到现在已完成的动作.用在这里正确.第二句不能改成yes, i have went to the u.s once?因为went不是过去分词,只是过去...
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