I believe the time will soon come ___ there will be no weapons in the world

题目

I believe the time will soon come ___ there will be no weapons in the world
为什么填when 不是that that 不是做time 的同位语吗?

答案

when,这个地方关系副词when引导的从句作为定语从句修饰time
我相信世界上再没有武器的日子会很快到来.