what和that都可以用于名词性从句(如以上你的句子),但what做成分(如主语,宾语等),而that不做成分 在定语从句中,只可用that,不可用what 你的上面的句子是名词性从句she was so angry at ----- 缺少对象(名词),故用what 明白了吗?
第2个回答 2020-01-28
1. that 不应该在句子中出现二次. 2. that通常後面那句是完整句子,what通常加问句. he was doing不完整, what he was doing就是她生气的原因,指的是他在做的事. 3. at 後面不会加that. she was so angry that he just ignored her. 这里就可以用that,因为他不理她是完整的句子,是她生气的原因.