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单选题
A new technique _____, the output of the shirt factory increased by 50 per cent.
A

having been worked out

B

has introduced

C

having worked on

D

has been turned out


参考答案

参考解析
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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