2. 专升本
  3. The new technique______, the yields as a whole increased by 20 percent.

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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