题目

Not until I came home last night ________ to bed. A．Mum did go  B．did Mum go C．went Mum  D．Mum went 答案：B 题考查Not until 引导的倒装。句意是：昨天晚上直到我回家妈妈才上床睡觉。原句是：Mum didn't go to bed until I came home. 为了强调时间状语从句until I came home把not until I came home 放在句首，使主句形成部分倒装，把且动词did提到主语Mum 前。

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