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

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

选项 A、back
B、back—up
C、back—out
D、background

答案B

解析 对重要文件要做备份,存储在别处,以保护您的信息。
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