He was very busy yesterday, otherwise he ____ to the meeting. [ ]

A. would come    

B. would have come  

C. came          

D. had come

X线平片在长骨干骺端可见到偏侧性的膨胀性骨质破坏透亮区，其内可见数量不等的骨嵴；CT平扫可见骨端的囊性膨胀性骨破坏区，骨壳基本完整，骨破坏与正常骨小梁的交界处多没有骨增生硬化带。应考虑的疾病是（）

A.溶骨型骨肉瘤

B.成骨型骨肉瘤

C.混合型骨肉瘤

D.骨巨细胞瘤

E.骨软骨瘤