题目内容
（请给出正确答案）
[主观题]
A new technique______, the yields as a whole increased by 20 percent since last year.A．wor
A new technique______, the yields as a whole increased by 20 percent since last year.
A．working out
B．having worked out
C．having been worked out
D．to have been worked out
提问人：网友cui163007
发布时间：2022-01-06
如搜索结果不匹配，请 
