The reasonhe was late was he missed the train.A. that; whyB. that; thatC. why; thatD. why;

问题补充：

The reasonhe was late was he missed the train.

A. that; why

B. that; that

C. why; that

D. why; why

答案：

A. that; why

B. that; that

(答案→)C. why; that

D. why; why

解析：考查定语和表语从句，第一空填why，引导定语从句，修饰the reason，定语从句中缺少原因状语，第二空是that，因为主语是the reason时，表语从句用that引导，句意是：他迟到的原因是他错过了火车。选C。