— Can you go to the mall this weekend?

— Sorry, I have volleyball _____ with our school team. Maybe _____ time.[ ]

 A. training; other    

B. training; another  

C. train; other    

D. train; another

一个类可以从直接或间接的祖先中继承所有属性和方法。采用这个方法提高了软件 的【 】。