A new technique________, the yields as a whole increased by 20 percent.A、working

游客2023-10-21 60

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

解析研究出一种新技术后，总产量提高了20％。独立主格结构题。句子的主语是the yields，而空格前有一个主语A new technique，跟句子的主语不一致，说明逗号前是独立主格结构。根据语义，新技术已经被研制出来了，所以要用现在分词的完成被动式，所以C项为正确答案。

转载请注明原文地址:https://tihaiku.com/zcyy/3118021.html

相关试题推荐

随机试题

最新回复(0)

________combinationoftechniquesauthorsuse,allstories—fromthebriefestane