________ in every aspect of his company's business, Paul made himself busy day and night.[ ]

A. Being involved 

B. Involved

C. Involving  

D. To involve

股骨易发生缺血性肌挛缩的骨折部位是：（）

A.股骨颈骨折

B.股骨转子间骨折

C.股骨干骨折

D.股骨髁间骨折

E.股骨髁上骨折