The reason he gave at the conference last week for his being carelessness was funny.
A. why
B. for which
C. that
D. for that
网友回答
A. why
B. for which
(答案→)C. that
D. for that
解析：考查定语从句。句中先行词为the reason，在从句中作gave的宾语，故用关系代词that。句意：上个周他在会议上由于他粗心所给出的原因真的好笑。