The new technique______, the yields as a whole increased by 20 percent.

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问题 The 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 work out所表示的动作发生在主句谓语动词之前,所以应用完成式。综上所述,选C。
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