A new technique（ ）,the yields as a whole increased by 20 percent.A.working outB.having worked outC.having been worked outD.to have been worked out
A new technique（ ）,the yields 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
B.having worked out
C.having been worked out
D.to have been worked out
参考解析
解析：该题考查独立主格结构。其中A new technique与work out之间的关系是被动关系,所以排除A、B选项,而D选项为不定式完成式的被动式,常用于sb./sth.is said/believed to have（been）done...这样的句型中,表明其动作在谓语动词动作之前已发生,如：He is said to have written some books.或His works is believed to have been translated into ma
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