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单选题
A new technique ______ , the gross output increased by 20 percent.
A
working out
B
having worked out
C
having been worked out
D
to have been worked out
参考答案
参考解析
解析：
句意：因为研制出了一种新技术，所以总产量增加了20%。work out与technique之间是被动关系，所以排除选项A、B。技术研制应发生在产量增加之前，故用ing形式。
句意：因为研制出了一种新技术，所以总产量增加了20%。work out与technique之间是被动关系，所以排除选项A、B。技术研制应发生在产量增加之前，故用ing形式。
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