One day you may be able to ring up a librarian,and ask __ (borrow) a book.
问题描述：
One day you may be able to ring up a librarian,and ask __ (borrow) a book.
填to borrow 还是borrowing 为什么?
答
考语法知识.ask sb to do sth .根据前面的形式,肯定选择ask to borrow 无疑
楼主钻牛角尖,楼主有毛病