A new technique _____, the output of the

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问题 A new technique _____, the output of the shirt factory increased by 50 per cent.A.having been worked outB.has introducedC.having worked onD.has been turned out

选项 A.having been worked out
B.has introduced
C.having worked on
D.has been turned out

答案 A

解析句意：由于产生了一项新的技术，衬衫加工厂的产量增加了50%。句子主语是工厂，与研究出一项新技术是主动关系，故此应该用现在分词做伴随状语，故A项正确。work out设计出，作出，计算出。turn out结果是。introduce引进。work on继续工作, 设法说服, 影响。根据语法和句意，A项正确。

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