it was not yet eight o'clock before he arrived home.求翻译外加before用法

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• it was not yet eight o'clock before he arrived home.求翻译外加before用法
• not...until的用法昨天遇到的一道题：- Did Jack come back early last night?- Yes.It was not yet eight o'clock ___ he arrived home.A.before B.when C.that D.until答案给的是B,讲解是时间状语It is...when用法.为什么不能选D呢?能详细讲解下not...until用法吗?
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