The teacher and writer as well as some students         something when we entered the room.

A．discussed

B．were discussing

C．have discussed

D．was discussing

老年女性，不慎摔倒，左髋部着地，当即左髋剧痛，不能站立，急诊来院。检查见左下肢缩短，外旋畸形。其最可能的诊断是（）.

A.左髋关节前脱位

B.左髋关节后脱位

C.左髋关节中心脱位

D.左股骨颈骨折

E.左股骨干骨折