- 单选题A new technique( ), the yields as a whole increased by 20 percent.
- A 、working out
- B 、having worked out
- C 、having been worked out
- D 、to have been
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参考答案【正确答案：C】
【译文】由于研发出了新的技术，总产量增长了 20%。
【解析】鉴于“技术”与“研发”在语义上是“被动”关系，故可排除A和B； C和D都可与前面的名词短语A new technique构成独立主格结构，但考虑到worked out和increased两个动作行为的发生时间，可知两者存在明确的“先后”顺序，且前者是后者发生的原因，由此可以排除D (不定式表示将来），C为正确项。C项在语义上相当于一个原因状语从句：As a new technique had been workedout...。
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