As I have a meeting at four

As I have a meeting at four 是状语从句 that I can spare to talk with you.是定语从句 不是同位语从句 spare是及物动词 要跟宾语 这里that(指all)是宾语 非常不同意楼下的说法 all就是先行词 从句I can spare to talk with you不完整 that指代all做spare 的宾语 同位语从句必须为完整的句子 例 The news that John won the game surprised us 中的同位语从句John won the game 完整