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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：
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。
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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