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

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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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He______(earn)alotofmoneybyworkingintheevenings.hasearned句意：他利用晚上工作，