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A new technique______, the yields as a whole increased by 20 percent.A、working o
A new technique______, the yields as a whole increased by 20 percent.A、working o
游客
2023-11-18
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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
考查独立结构。根据句子结构,这里应该用独立分词结构,故选项D错误。同时,work out和a new technique是逻辑动宾关系,所以此处只能使用过去分词结构或使用被动语态的现在分词结构。由此可以看出正确答案为C。
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