One of the English teachers Kate eventually __________ her project to the school board for their approval of the speech contest.

A．admitted

B．permitted

C．submitted

D．recommend

关于股骨头坏死最常见的病因，下列哪个答案是正确的（）

A.股骨颈骨折

B.酒精中毒

C.肿瘤放射治疗

D.长期大量使用或滥用激素

E.创伤性髋关节后脱位