题目内容

The reason       he is late is    there was a breakdown on the railway．
A．why; thatB．because; thatC．that; becauseD．why; why
A

试题分析：经过分析句子结构，可知这个句子中包含一个定语从句和一个表语从句。关系词在定语从句中作原因状语，故用why。引导词在表语从句中不作任何成分，且没有实际意义，故用that。
点评：分析清楚句子结构是关键，根据引导词在句中所作的成分以及含义，选择正确的引导词。
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