Each time ____ they met,they would talk long hours together.
问题描述：
Each time ____ they met,they would talk long hours together.
请问为什么答案是不填?状语不就因该填 ”when“
答
each time ,属于名词可以直接引导时间状语从句,类似的有the moment
如：I returned his money the moment I saw him .