(单选题)5: 在UNIX下当你完成任务，想要退出系统时，可在提示符后面输入（ ）之后，按下Enter键
A: shell
B: logout
C: back
D: lock
一、选择填空：阅读下面的对话或句子，从A、B、C三个选项中选出一个能填入空白处的最...
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