Not until it was completely dark_________working.A、had they stoppedB、they stopp

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问题 Not until it was completely dark_________working.

选项 A、had they stopped
B、they stopped
C、they didn’t stop
D、did they stop

答案 D

解析 not until置于句首时，句子需使用倒装。句子使用的是一般过去时，因此倒装的方法是将助动词did放到前面。故选D。

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