【单选题】

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

B．having been worked out
C．having worked out
D．to have been worked out

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根据网考网移动考试中心的统计，该试题：

3%的考友选择了A选项

80%的考友选择了B选项

15%的考友选择了C选项

2%的考友选择了D选项

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