it was_back home after the experiment.为什么不选C

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it was_back home after the experiment.为什么不选C
it was _____back home after the experiment.
A not until midnight did he go
B until midnight that he did not go
C not until midnight that he went
D until midnight when he did not go
为什么不选C
没有人会答此问题，此问题已关闭

这个问题,如果没有上下文,或语境限制,那么,表达的意思就会有所不同,因此,所选答案就会有异.
①如果选B,全句是：
It was 【 until midnight that he did not go 】back home after the experiment.
句意是：实验之后,直到半夜他还没有回家.
②如果选C,全句是：
It was 【not until midnight that he went 】back home after the experiment
句意是：实验之后,直到半夜他才回家.
③区别的关键：
否定对象不同——前者否定从句动词,后者否定全句事件和内容.
因此,没有特定语境,两个答案语法上都可以选,只是【表达意义和强调重点不同】.

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