_______ any reply, he had to send a second request.   [ ]

A. Not to receive  

B. Having not received

C. Not receiving  

D. Not having received

女性，75岁，股骨颈骨折，GardenⅣ型，首选的治疗方法是（）。

A.人工髋关节置换

B.加压空心钉内固定

C.人工股骨头置换术

D.三翼钉内固定术

E.保守治疗