有个英语定语从句的问题,希望大家帮忙回答下winter is a time of year ——days are long and night are short空白处填that or when
问题描述：
有个英语定语从句的问题,希望大家帮忙回答下
winter is a time of year ——days are long and night are short
空白处填that or when
答
that