The reason he is late isthere was a breakdown on the railwayA. why; thatB. because; thatC

问题补充：

The reason he is late isthere was a breakdown on the railway．

A. why; that

B. because; that

C. that; because

D. why; why

答案：

(答案→)A. why; that

B. because; that

C. that; because

D. why; why

解析：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。