Not until it was completely dark ______working.

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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

解析倒装结构题。本题考查not until的倒装句型，not unlil提到句首时，主句中主谓部分要倒装。

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专业英语四级

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