She spoke so fast and left the room before they were able to understand she said meant.A.

问题补充：

She spoke so fast and left the room before they were able to understand she said meant.

A. what

B. that

C. what what

D. what that

答案：

(答案→)A. what

B. that

C. what what

D. what that

解析：考查名词性从句。what she said meant做understood的宾语，what she said 做meant的主语， what做she said 的宾语。that引导从句，那后面应该是一个完整的句子，而 she said meant不是一个完整的句子。故选A。