关于阴部内动脉的说法正确的有()

A．在管内发出2～3支肛动脉

B．走行于阴部管内

C．穿坐骨小孔人坐骨肛门窝

D．是坐骨肛门窝内的主要血管

E．在管前端分为会阴动脉和阴茎(蒂)动脉

When I last saw them, the police had chased the robbers down Columbus Street.

A．were chasing

B．was chasing

C．chased

D．were on a chase