问题描述：
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）
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）
问题解答：
我来补答展开全文阅读