所谓“因虚致实”，主要体现的辨证关系是

A．对立关系

B．统一关系

C．因果关系

D．转化关系

E．邪正关系

-What makes her so frightened?    

-Oh, it is the mouse that she ___ on her bad while looking for her watch．[ ]

A. came about          

B．came across        

C．came through        

D．came up