Mother was so angry at all I was doing she walked out.
A. that；that
B. what；that
C. what；as
D. that；which
网友回答
(答案→)A. that；that
B. what；that
C. what；as
D. that；which
解析：首先通过分析句子结构，可知这个句子中包含一个状语从句和一个定语从句，其中定语从句的先行词是不定代词all，所以只能用that；so … that… 如此……以致，是状语从句的固定句式，故选A。