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 研究出一种新技术后，总产量提高了20％。独立主格结构题。句子的主语是the yields，而空格前有一个主语A new technique，跟句子的主语不一致，说明逗号前是独立主格结构。根据语义，新技术已经被研制出来了，所以要用现在分词的完成被动式，所以C项为正确答案。
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