The total output of this factory (double)________ since it was put into operatio

游客2023-09-24  27

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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