—When did you go to the United States?

-- I remember _______ there when I was ten.

A．having taken

B．to be taken

C．being taken

D．to take

若导管置管于（），则血浆分离中心导管的末端应定位于上腔静脉与右心房的连接处。

A.上腔静脉中下段

B.锁骨下或颈内静脉

C.上腔静脉上段

D.颈内静脉

E.锁骨下静脉