— Would you like to go travelling with me to New York, Benjamin?  

—  Sorry, I’m busy, for the final examination is coming. So I ___ hard throughout the next several weeks.[ ]

A. have worked        

B. have been working    

C. work      

D. will be working

骨折临床愈合后，骨痂的改造塑形决定于（）

A.外固定的牢固性

B.肢体活动和负重所形成的应力

C.局部血液供应情况

D.骨痂的多少

E.是否配合治疗