—Do you know the lady is interviewing our headmaster?—Yes she is a journalist from CCTV.

问题补充：

—Do you know the lady is interviewing our headmaster?

—Yes, she is a journalist from CCTV.

A. which B. who C. whom

答案：

解析：定语从句修饰人，先行词在定语从句中做主语，故用who。