答案及解析：[单选题]Files can be lost or destroyed accidentally. Keep（）copies of all data on removable storage media. - 软件水平题库- 答案窝(daanwo.com)-大学生作业答案及考资分享平台

问题：

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[单选题] Files can be lost or destroyed accidentally. Keep（）copies of all data on removable storage media.

A.backup

B.back

C.black

D.backdown

答案解析：

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