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
网友回答
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。