The reason he was late was he missed the bus.
A. why, because
B. why, that
C. that, why
D. because, why
网友回答
A. why, because
(答案→)B. why, that
C. that, why
D. because, why
解析：句意：他迟到的原因是他没有赶上火车。第一空是why引导的定语从句，它在从句中作状语，that引导的表语从句，that在从句中不作成分，the reason why…be that…故选B。