The reason he was late was he had taken a wrong bus.A. why; becauseB. for; because ofC. wh

问题补充：

The reason he was late was he had taken a wrong bus.

A. why; because

B. for; because of

C. why; that

D. for; that

答案：

A. why; because

B. for; because of

(答案→)C. why; that

D. for; that

解析：考查固定句型和短语从句。固定句型：The reason is/was that…原因是…；that引导表语从句。第一空是定语从句why he was late修饰先行词the reason.句意：他迟到的原因是乘错了公交车。故C正确。