She said to me, "My mother took me to an exhibition yesterday."

She told me that her mother had taken __ to an exhibition the day before. [ ]

A. she      

B. me

C. her      

D. you

使用挂梯时每片挂梯或跳板上施工人员不得超过（），挂梯及跳板上不得堆放（）。