[单选题]计算机杀毒时，说法不正确的是______。

A、应及时升级杀毒软件
B、杀毒前应先对杀毒盘进行杀毒
C、即使是在Windows 系统下杀毒，也应制作一张DOS 环境下的杀毒盘
D、杀完毒后，应及时给系统打上补丁

参考答案： B

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