填空题

( )删除文件 ( )按ESC退出系统

【参考答案】

F、K
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thorough experience
单项选择题
A．He is ok now.B．He is ill.C．He is coming tomorrow.D．He is doing exercises.
A．He is ok now.
B．He is ill.
C．He is coming tomorrow.
D．He is doing exercises.
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