作业帮he borrow the book four days改同义句A four day has passed since he borrowed the books.B it's four days since he kept the book.b 是不是错在kept(延续性）
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he borrow the book four days改同义句A four day has passed since he borrowed the books.B it's four days since he kept the book.b 是不是错在kept(延续性）
he borrow the book four days改同义句
A four day has passed since he borrowed the books.
B it's four days since he kept the book.
b 是不是错在kept(延续性）
he borrow the book four days改同义句A four day has passed since he borrowed the books.B it's four days since he kept the book.b 是不是错在kept(延续性）
答案的确是A.
B错在since从句的动词kept是延续性动词,此时句意必须否定翻译为：
自从他没保留那本书以来,已经4天了.
即：他已经4天没有保留那本书了.
B必须把kept改成瞬间性动词borrowed才对,此时句意正常翻译为：
他借书以来,已经4天了.即：他已经借书4天了.
更正一楼团友说法：it is + 一段时间 + since从句 = it has been + 一段时间 + since从句
但是必须要注意此句型中since从句的谓语动词是延续性动词还是瞬间性动词.
如果是延续性动词,则从句否定翻译.
如果是瞬间性动词,则从句正常翻译.
可能是，可以查下since的用法
B应该是， it has been four days since he kept the book。kept是正确的。