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考研
______a new technique, the yields as a whole increased by 20 percent.
______a new technique, the yields as a whole increased by 20 percent.
admin
2019-07-31
4
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
现在分词的完成时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。
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考研英语一
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