My mother _____ a player,  her leg was broken in one game,  she has given up ever since.                   [ ]

A. is                                  

B. use to be                    

C. used to be

关于Roger氏病，以下哪项不对（）

A.系室间隔小缺损

B.临床无明显症状

C.左向右分流量小

D.肺血管阻力正常

E.一旦发现需手术治疗