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  3. A new technique ______, the yields as a whole increased by 20 percent.

A new technique ______, the yields as a whole increased by 20 percent.

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问题 A new technique ______, the yields as a whole increased by 20 percent.
选项 A、working out
B、having worked out
C、having been worked out
D、to have been worked out
答案C
解析 本题考分词的独立结构作状语的用法。结合语态，故C项正确。本句大意为：新技术研究出来之后，整个产量增长了20%。
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