2. 外语
  3. A new technique ______, the yields as a whole increase by 20 percent.

A new technique ______, the yields as a whole increase by 20 percent.

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问题 A new technique ______, the yields as a whole increase by 20 percent.
选项 A、working out
B、having been worked out
C、having worked out
D、to have been worked out
答案B
解析 由于研究出了新技术，总产量增长了20%。此题考查分词的独立主格结构及其完成式的被动语态。句子的前半部分是原因状语，要用分词担当，而动词work out与其逻辑主语a new technique是被动关系，因此要用分词的被动式。
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