单选题_____AinBupCoutDto
单选题
_____
A
in
B
up
C
out
D
to
参考解析
解析：
sign out登记并离开，签退。符合句意“退出使用的电脑”，故选C。sign in注册；签到。sign up登记；注册。D项to一般不与sign构成短语，且不符合句意。
sign out登记并离开，签退。符合句意“退出使用的电脑”，故选C。sign in注册；签到。sign up登记；注册。D项to一般不与sign构成短语，且不符合句意。
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