初三英语填空题.~~~~~~~~~求解

题目

初三英语填空题.~~~~~~~~~求解
She was so angry at_____he was doing____she walked out and closed the door heavily behing her.
用 that 或 what 填空.解释下

答案

第一个 what 第二个 that
分开来看,angry at what he was doing 中 what 引导宾语从句
so + 形容词 + that 从句
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