A new technique ________, the yields(产量)as a whole increased

A new technique ________, the yields(产量)as a whole increased by 20 percent．
A. working out
B. having worked out
C. having been worked out
D. to have been worked out
atreeinspring 1年前他留下的回答 已收到1个回答

王旭光 花朵

该名网友总共回答了24个问题，此问答他的回答如下：采纳率：87.5%

答案C
technique与work out之间是被动关系.

1年前他留下的回答

3

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