The reason he was late was he missed the bus.A. why thatB. why becauseC. that whyD. b

问题补充：

The reason he was late was he missed the bus.

A. why, that

B. why, because

C. that, why

D. because, why

答案：

(答案→)A. why, that

B. why, because

C. that, why

D. because, why

解析：考查定语从句和表语从句，第一空后是要定语从句，the reason 为先行词，在从句中作状语，表原因，故用why。第二空 that引导的是表语从句，这时候一般不省略。that在引导名词性从句的时候(主语、宾语、表语、同位语从句)，都没有实际意义，只作引导词，但是只有宾语从句中的that被省略。