算法分析的目的是( )。

A．找出数据结构的合理性

B．找出算法中输入和输出之间的关系

C．分析算法的易懂性和可靠性

D．分析算法的效率以求改进

— How are the team playing?

— They're playing well, but one of them________hurt. [ ]

A. got  

B. had

C. turned  

D. become