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A
Working out
B
Having worked out
C
Having been worked out
D
To have been worked out
正确答案 :C
解析
【金标尺答案】C 【金标尺解析】本题考查英语词法——动词。 句意:新技术推出以后,产量总体上增加了 20%。 现在分词的完成式表示分词的动作发生在主句谓语动作之前,由“having+过去分词” 构成。根据句意可知,新技术的推出是在产量上升之前发生的,故 C 项符合题意。 A、B、D 项为干扰选项,故排除。 故本题答案为 C。
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