—Have you been to the United States?

—Yes, only once. I ________ there only for seven days.

A．stayed

B．had stayed

C．have stayed

D．was staying

距骨颈骨折整复后，应将踝关节固定在（）。

A.背伸位

B.中立位

C.功能位

D.跖屈稍内翻位

E.跖屈稍外翻位