2. 外语
  3. The total output of this factory (double)________ since it was put into operation in 2006.

The total output of this factory (double)________ since it was put into operation in 2006.

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问题 The total output of this factory (double)________ since it was put into operation in 2006.
选项
答案has doubled
解析 根据句子关系可知，空格处应为句子的谓语结构；根据since一词可知，此处应使用现在完成时，故此处应填入has doubled。
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