It became clear to me at the end of the interview they really cared about.
A. which
B. how
C. that
D. what
网友回答
A. which
B. how
C. that
(答案→)D. what
解析：句意:我清楚了在面谈结束时,他们真正关心的。it是形式主语，what they really cared about是真正的主语从句，cared about后面缺少宾语，表示关心的内容，用What充当cared about的宾语。故选 D. What考点：考查名词性从句的用法。