A new technique out, the yields (收成) increased by 20% .
A. having working
B. having been working
C. has worked
D. had been worked
网友回答
A. having working
(答案→)B. having been working
C. has worked
D. had been worked
解析: 根据逗号分开可知空白处不能填入谓语动词,A项从形式上就不对,根据语境应该用现在分词的完成式,此处work out表示“产生结果;有预期的结果,发展为”例如:I wonder how their ideas worked out in practice?我很想知道他们的想法在实践中取得了什么结果。