有些畸形大型工件因考虑到加工划线的困难，故在毛坯上设计一些工艺孔或凸缘(工艺塔子)，这样可以方便加工和划线。( )

With the help of the new equipment, our factory produced _____ VCD players in 2009 as the year before. [ ]

A. as many as twice

B. twice more than

C. as twice many

D. twice as many