Make( )copies of important files, and store them on separate locations to protect your information.

2023-09-01

A.back
B.back-up
C.back-out
D.backgrounD.

参考答案:B

()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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