Tian Dong, together with his classmates, ________ because of ________ the school rule．
A.was punished, obeyingB.were punished; breakingC.were punished; obeyingD.was punished; breaking在线课程D
解析：
从句意看，首先排除A、C两项。因为遵守学校的规章制度是不应该受到惩罚的。together with his classmates 是状语，主语为Tian Dong，谓语动词应用单数形式，故选D项。