He shook his head each time the waiter brought him something to drink.为什么不用WHEN
问题描述：
He shook his head each time the waiter brought him something to drink.为什么不用WHEN
为什么不用在each time后加When
答
each time 在这里就相当于when 的作用 引导时间状语从句 意思为 每一次