Mary is being punished（惩罚） by the headmaster. That was she broke the school rules.A. whyB

问题补充：

Mary is being punished（惩罚） by the headmaster. That was she broke the school rules.

A. why

B. because of

C. the reason why

D. because

答案：

A. why

B. because of

C. the reason why

(答案→)D. because

解析：本题的含义是校长惩罚了玛丽，那是因为她违反了学校的制度，表示原因可用because引导表语从句，故本题选D。