All the task          ahead of time, they decided to go on holiday for a week.[       ]

A. had been finished      

B. were finished  

C. having been finished  

D. been finished

骨肉瘤的X线表现有（）。

A.溶骨性破坏

B.瘤骨形成

C.三角形及放射状骨膜反应

D.局部软组织肿块

E.死骨形成