_________is known to us all,America is a developed country__________the first world.   [ ]

A. Which; belonging to            

B. Which; belonged to    

C. As; belonging to                  

D. As; belonged to

（）就是根据画稿里的虚实关系的需要采取阴刻和阳刻交叉的办法，能使画面效果更为丰富，主次更加分明。