Jim has been looking for his dictionary for almost an hour, and Tracy forgot to tell him that David

________it ________2 hours ago.[ ]

A. took; away  

B. took; in

C. took; over  

D. took; on

下列选项中，不是一个算法的基本特征的是( )。

A．完整性

B．可行性

C．有穷性

D．拥有足够的情报