The reason he was late was he missed the bus.
A. why, that
B. why, because
C. that, why
D. because, why
网友回答
(答案→)A. why, that
B. why, because
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，why在定语从句中状语，先行词是reason；第二空是that引导的表语从句，that在表语从句中不做成分。固定句式The reason why……be that…,故选A。