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  3. A new technique______, the output as a whole increased by 20 percent.

A new technique______, the output as a whole increased by 20 percent.

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问题 A new technique______, the output as a whole increased by 20 percent.
选项 A、working out
B、having worked out
C、to have been worked out
D、having been worked out
答案D
解析 此题考查独立主格结构。前半句与题中前半句与后半句仅用逗号衔接，没有出现并列连词或从属连词，推测出应选非谓语形式。选项中动词“work out”与其逻辑主语“technique”之间为被动关系，应首先排除A，B，选项；又因分词动作先于主句的谓语动词发生，故选用分词的完成被动时态做原因状语，故D项符合题意。
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