It was __________ back home after the experiment.
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"答案C

此题考查的是not…until句型的强调结构,其最根本结构是:He did not go back home after the experiment.①,把①转变为Not until midnight did he go back home after the experiment.②,注意②中的倒装结构,把②中划线部分放在强调结构It be 被强调部分that…中进行强调,但注意that从句后面不用倒装形式."