I shall never forget the day ________ Shen Zhou V was launched,为什_英语解答

I shall never forget the day ________ Shen Zhou V was launched,
为什么填when而不是that

人气：153 ℃　时间：2020-04-16 05:38:14

解答

引导词作状语（从句句子成分完整）that不能做状语吗that 是代词，不能作状语。