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i borrowed a book from the library a week ago.变现在完成时

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i borrowed a book from the library a week ago.变现在完成时
为什么
i borrowed a book from the library a week ago.变现在完成时
I have kept a book from the library since a week ago.
或 I have kept a book from the library for a week .
borrow是终止性动词,与SINCE /FOR 短语连用要改为持续性动词:keep ,它的过去分词是:kept
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再问: 补充一下,=A week _______ ______ since I borrowed the book
再答: A week (has passed ) since I borrowed the book
再问: 为什么
再答: 根据句意呀 原句: 一周前我从图书馆借了一本书 变成完成时: 自从我借这本书以来,一周过去了。