For security reasons, always log ______ when you leave your computer unattended

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问题 For security reasons, always log ______ when you leave your computer unattended for any period of time.

选项 A、on
B、up
C、in
D、out

答案 D

解析句意：出于安全考虑，当你一段时问不用电脑时，你最好退出系统。log out退出。log on 登录。log in注册。

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Forsecurityreasons,alwayslog______whenyouleaveyourcomputerunattended