We are living in an age _____ everything is changing rapidly.

题目

We are living in an age _____ everything is changing rapidly.
A when B that C which
帮解释一下为什么其他的错

答案

A when = in which
因为定语从句的完整结构应该是：everything is changing rapidly in the age 所以用in which才对 所以选A when