是定语从句 那本书就是他星期五借走的那本吗? 把疑问句还原一下可知; that book is the one he borrowed on friday. 定the one (那本书),在从句中做宾语,所以可省略连接词which或that. 如果没有the one 这个定语从句便没有先行词,所以必须有.那本书就是那本书吗?为了避免重复,就用the one.
那就是那本他在星期五借的书吗? 可以转换成陈述句来看: That book is the one he borrowed on Friday. the one指代the book he borrowed on Friday. 例: He is the one who met Mr Green in the hall 他就是在大厅遇见格林先生的那位.