--- ___________     --- Drop in if you have time.

A．Well, I really have to leave now.

B．I wonder if you could let me go now.

C．I’d like to go now.

D．Do you mind if I leave now?

可引起股骨头无菌性坏死的药物最常见的是

A．氯喹
B．雷公藤
C．甲氨蝶呤
D．糖皮质激素
E．长春新碱