新概念英语2册48课问题.

题目

新概念英语2册48课问题.
Meanwhile,my tongue was busy searching out the hole where the tooth had been.
请问这里的where引导的是什么从句
where the tooth had been.后面怎么没有宾语啊?

答案

where引导的 是定语从句 修饰先行词hole ,意思是说the tooth had been in the hole.关系副词where =in which ,因此这句话也可以说：Meanwhile,my tongue was busy searching out the hole which the tooth had been ...