As your request for the change of destination came at such short (), we have to ask you to extend shipment till the end of the month.
A. time
B. period
C. duration
D. notice
(Looking) from (another) angle, the painting (would) show (something different).
A. Looking
B. another
C. would
D. something different
教学系统、自学系统和测试系统等是计算机在( )中的应用。
A. 计算机通信
B. 数据处理
C. 计算机辅助系统
D. 人工智能的研究和应用
每个工作Excel表共有( )列。
A. 256
B. 562
C. 65536
D. 56636