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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
D.backgrounD.
B.back-up
C.back-out
D.backgrounD.
参考答案
参考解析
解析：（）重要文件的副本，并存储在不同的位置以保护您的信息。A后退B.备份C退出D.背景
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