A. why it is that B. why is it which

C. who is it which D. who it is which

【答案】A

【解析】

考查特殊疑问句。本题考查特殊疑问句的疑问形式why it is that，同时这是一个强调句型。句意：我不知道为什么班级每个人都认为我好玩。故选A。