A.TheuserhasnotregisteredthecopyofWindows.
B.TheuserhasnotappliedatleastServicePack1totheirsystem.
C.Theuserdoesnotknowwhatsitetoaccessfortheupdates.
D.TheuserneedstoflushtheDNScache.
参考答案：B
ATheuserhasnotregisteredthecopyofWindowsBTheuserhasnotapp
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