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Recently i've come across sentences that doesn't have one in it and it looks like odd to me because i'm used to say which one.? the sentences must be correct because they are. 我买的电脑自带office 已激活，好像是永久的这个onedrive自动备份，我打游戏老是跳ping 平时文件处理也比较少，有必要留着这个东西不显示全部关注者 12