The reason he was late was he got up lateA. which , becauseB. why , thatC. that, thatD. wh

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A. which , because
(答案→)B. why , that
C. that, that
D. why ,because
解析：考查定语从句和表语从句。本题第一空why引导定语从句，修饰先行词the reason；当先行词是reason，且后面的定语从句很完整的时候，使用关系副词why；第二空是that引导的表语从句，that在句中不充当任何成分，只起引导作用。句意：他迟到的原因是他起床晚了。故B正确。