打开一个已存在的绘图文件的步骤是()
A、单击“文件”“打开”命令
B、从“搜索”列表框中选择存储绘图文件的驱动器
C、双击该文件名
D、预览绘图文件
参考答案:A, B, C
The father and the son entered the tiger area _______ two doors were open at the time.
Suddenly five tigers appeared, one of which killed the father.
A.there
B.which
C.its
D.whose