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A new technique______, the yields as a whole increased by 20 percent since last
A new technique______, the yields as a whole increased by 20 percent since last
游客
2025-03-20
33
管理
问题
A new technique______, the yields as a whole increased by 20 percent since last year.
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
本题考查非谓语动词,选项中work out的意思是“作出、推出”。全句意思是:“新技术推出以后,总产量从去年起增加了20%。”从结构来看,逗号前应是一个分词独立结构,作句子的状语(本句中表示原因)。to have been worked out中用的是动词不定式,所以选项D不是答案;动词work out是及物动词,new technique(新技术)是work out的动作对象,所以要用被动态语态,而选项A和B都是主动语态,都不可能是答案。work out这一动作发生在本句谓语动词的动作之前,应该用现在分词完成式的被动语态。所以having been worked out是答案。全句相当于:As a new techniquehad been worked out,the yields as a whole increased by 20 percent since last year.
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