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23.it was not until it got dark ______ working

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23.it was not until it got dark ______ working
A)that they stopped
B)when they stopped
C)did they stop
D)that they didn’t stop
23.it was not until it got dark ______ working
这是一个not until句型的强调句.
一般强调句的结构是:It is/was +被强调成分+that/who+其余成分
所以强调not until引导的时间状语或者时间状语从句是,句子结构是这样:
It is/was +not until+从句+that+其余成分(这时候,not已经提到被强调成分中,所以that后面再不用否定词.)综上所述,答案为A