2. 外语
  3. Not until it was completely dark ______ working.

Not until it was completely dark ______ working.

admin2020-05-20  41
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 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，故选D项。
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