2. 外语
  3. Not until late afternoon____________(他们才开始)to tackle the major problem.

Not until late afternoon____________(他们才开始)to tackle the major problem.

admin2013-06-17  27
问题 Not until late afternoon____________(他们才开始)to tackle the major problem.
选项
答案did they begin
解析 该题考点就是否定词在句首时，谓语要部分倒装，所以要把“did”提前。
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大学英语四级

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