The old man was so angry and spoke so fast that none of his children understood ----he said meant.

D答案是B不好意思，看漏了！原句的意思是：“他说的话意味着的”，先是“what he said”,他说的话，“what (what he said )meant"就是括号里面的意味着的。He said a lot, but I didn't understand_____he said meant. Aall that B what that Cwhat all Dthat allC此处的all具有和what一样的作用。