It became clear to me at the end of the interview ________ they really cared aboutA.whichB.howC.thatD.what
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D解析试题分析：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。