英语问题 大伙帮个忙

Question

This was a time when the two countries were at war这是个定语从句 为什么用 when ，先行词是a time 把它代入从句中，做时间状语，怎么代，时间状语放在从句中的哪个位置？具体的分析下 谢啦

Answer 1

首先，a time 是指一段时间，其次，when 引导的是定语从句，所以用when 。

Answer 2

the two countries were at war at a time.(when相当于at which)