4.I was so angry at all that he was doing that l walked out

问题描述:

4.I was so angry at all that he was doing that l walked out
这里的at all that he was doing 是做什么成份的

你得把 was angry at 看成一整体 at后面的是宾语 其实all that 这里就相当于what
也就是说at后面跟了一个宾语从句
宾语从句的引导词啦