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。