Feng Xiaogang，＿＿＿＿＿＿＿＿＿by many as a leading director，left his handprint at the TCL Chinese Theatre．

A．to recognize

B．recognized

C．having recognized

D．to be recognized

简述炉渣的氧化性对转炉冶炼有哪些有利或不利的影响？