2. 外语
  3. A new technique____, the yields as a whole increased by 20 percent.

A new technique____, the yields as a whole increased by 20 percent.

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问题 A new technique____, the yields as a whole increased by 20 percent.
选项 A、working out
B、having worked out
C、having been worked out
D、to have been worked out
答案C
解析
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C类竞赛（非英语专业本科）

大学生英语竞赛（NECCS）

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