attachments-2021-04-WdJykeGa608123d9401f0.jpgthat前面的为一个句子,那that引导一个什么从句呢?若是定语从句感觉没适合的先行词。

that they say is ... and dates back ... 为嵌入式定语从句,先行词为 an ancient city。that在定语从句中作they say的宾语从句中的主语。