You can only be sure of ________ you have at present; you cannot be sure of something ________ you might get in the future.

A．that; what

B．what; /

C．which; that

D．/; that

在绩效考评的数据处理中，（）对考评工作的有效运作是至关重要的。

A.绩效考评数据的记录 

B.考评数据的统计 

C.考评数据的分析 

D.考评数据的保存