A new technique ____ out, the yields (收成) increased by 20% .A.having workingB.having been workingC.h

题目简介

A new technique ____ out, the yields (收成) increased by 20% .A.having workingB.having been workingC.h

题目详情


A new technique ____ out, the yields (收成) increased by 20% .
A.having workingB.having been working
C.has workedD.had been worked
题型:单选题难度:偏易来源:不详

答案

B
  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。

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