He called the police for help , that the problem was more than he could deal with.
问题描述：
He called the police for help , that the problem was more than he could deal with.
A having realizedB to realizeC realizedD realizing
答案是D,请问A为什么不行?
横线在that前面
答
如果having realized.,置于句首,那么这句话可以选A.
另外,这里选D,主要是realizing现在分词做状语.