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O LETTER plural O's or Oso plural o's or os HEJ, $oJn [C] the 15th letter of the English alphabet英语的第十五个字母O is used in speech to mean zero, and is sometimes written as 'oh'.零My phone number is three, one, o, five, one, double o (= 3105100).我的电话号码是3105100 。The date 1705 can be pronounced seventeen o five.1705年可以读成“17-0-5”An O level is a public examination in a particular subject that was taken in the past in British schools by children aged 15 or 16, or the qualification obtained.单项普通考试（过去英国学生在15或16岁参加的考试，通过可获得普通教育合格证书）I failed my History O level. [C]我没有通过历史的普通考。She's got 10 O levels. [C]她有十张普通教育合格证书。O levels were replaced by GCSEs in 1988.[C]1988 年普通中等教育证书代替了普通教育合格证书。 ☆A 中的 A level
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