The reason _______ he was late was _______ he missed the bus.A.why, thatB.why, becauseC.that, whyD.because, why
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A解析试题分析：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。考点：考查定语从句和表语从句
点评：本题也可以熟记一个句型结构：the reason why ...is that...，意为。。。的原因是。。。。即学即练：The reason _______ he was late for school was he was illA. why, because B. why, that C. that, why D. because, why选B