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
C、having been worked out
D、to have been worked out

答案C

解析句子的前半部分是一个带逻辑主语的独立结构，表示原因。

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英语

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