2. 外语
  3. A new technique______, the yields as a whole increased by 20 percent since last year.

A new technique______, the yields as a whole increased by 20 percent since last year.

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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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