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A new technique ______, the yields as a whole increase by 20 percent.A、working o
A new technique ______, the yields as a whole increase by 20 percent.A、working o
游客
2023-09-23
70
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问题
A new technique ______, the yields as a whole increase by 20 percent.
选项
A、working out
B、having been worked out
C、having worked out
D、to have been worked out
答案
B
解析
由于研究出了新技术,总产量增长了20%。此题考查分词的独立主格结构及其完成式的被动语态。句子的前半部分是原因状语,要用分词担当,而动词work out与其逻辑主语a new technique是被动关系,因此要用分词的被动式。
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