The English play ______my students acted at the New Year's party was a great success.

A.for which

B.at which

C.in which

D.on which

答案及解析： C

解析：

考查考生对题干中句子的含义和结构的理解和对选项中几个介词的掌握情况。which所引导的定语从句修饰的是主句中的play，其意思是：新年晚会上上演的我的学生(在其中)扮演角色的。而“在剧(其)中”在英语中表达为in the play。