关于鼻咽部纤维血管瘤的CT表现，下列哪项不符合

A．来自鼻咽顶部的软组织肿块充满鼻咽腔

B．并经后鼻孔长入充满同侧鼻腔

C．肿块边界清楚

D．无明显增强及延时增强表现

E．颅底骨质破坏

Although we haven't got accurate statistics, it is estimated that ______ 300 factories in this province

closed down during the economic crisis.[ ]

A. finally            

B. previously      

C. obviously          

D. approximately