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—— When will you be back?——I'll be back _____a couple of days.
A.after
B.for
C.about
D.in
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Make（ ）copies of important files, and store them on separate locations to protect your information.A.back
B.back-up
C.back-out
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I′m sorry I can′t see you immediately;but if you′d like to take a seat,I′ll?be with?you__________.A.for a moment
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D.at the moment
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按照要求写出对应命令：在当前目录下新建一个目录back，将当前工作目录更改为back，在back目录下新建2个空文件test1、test2，然后把test2移到其父目录中并改名为file3。
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