_____
A. 基类
B. 派生类
C. 抽象类
D. 用户定义类型
A.retireB.scienceC.giantD.behind
A. retire
B. science
C. giant
D. behind
The fisherman together with his sons always _________ a lot of fish.
A. catch
B. catches
C. catching
D. caught
_____
A. 回收站
B. 硬盘
C. 剪贴板
D. 软盘