—Why did he say so?
—Sorry, I don’t understand he has said means.
A. all what
B. what all
C. all that
D. that all
网友回答
A. all what
(答案→)B. what all
C. all that
D. that all
解析：考查what引导的宾语从句：句意：--他为什么这么说？--对不起，我不理解他所有的话的含义。What引导的是宾语从句，宾语从句中all是主语，he has said是宾语从句修饰all，what做mean的宾语。选B。