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标题: "I know if off by heart" means what? [打印本页]

作者: Louisa 时间: 14-10-2008 21:12
标题: "I know if off by heart" means what?
as title, thanks

作者: 127 时间: 16-10-2008 21:00
IT or IF?

know / learn sth off by heart = know / learn sth by heart

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