The reason he was late for the meeting was he forgot to use the alarm clock.A. which; be

问题补充：

The reason he was late for the meeting was he forgot to use the alarm clock.

A. which; because

B. why; because

C. why; that

D. that; because

答案：

A. which; because

B. why; because

(答案→)C. why; that

D. that; because

解析：考查句型： the reason why … is that … ，什么的原因是，句意：他会议迟到的原因就是他忘了使用闹铃。故选C。