在历代诗人赞美桂林山水的诗篇中写有“群峰倒影山浮水，无山无水不入神”的著名诗句写的“倒影”是由于光的______现象而形成的．如图9，清澈见底的漓江看起来比实际浅，是由于光的______现象而形成的______（选填“实像”、“虚像”）．

I don't know____ makes her afraid of having her business discussed. [ ]

A. what it is about Mary that

B. that is it about Mary that

C. what is it about Mary that

D. that it is about Mary that