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

Not until it was completely dark______working.

admin2016-10-07  39
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 until位于句首时，主句中主谓部分要倒装，故选[D]。
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