2. 外语
  3. Not until it was completely dark________working.

Not until it was completely dark________working.

admin2022-09-25  26
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 直到天完全黑了，他们才停止工作。倒装结构题。本题考查not until倒装句型，not until位于句首时，主句中主谓部分要倒装，从句使用了一般过去时，主句也应使用一般过去时，故选D项。
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