the days are gone ( ) physical strength was all you needed to make a living

题目

the days are gone ( ) physical strength was all you needed to make a living
答案是when这个我懂 为什么不能用that?不可以吧 从句 看成 days 的同位语么

答案

1．定语从句的先行词是名词或代词；而同位语从句的先行词只能是名词,而且仅限于idea,plan,fact,theory,promise,hope,news,doubt,truth,information,suggestion,question,thou-ght,belief,conclusion等少数名词....