The millions of calculations involved,_____by hand, would have lost all practica

游客2023-11-05 69

问题 The millions of calculations involved,_____by hand, would have lost all practical value by the time they were finished.

选项 A、had they been done
B、they had been done
C、having been done
D、they were done

答案 A

解析这是一句虚拟语气的句子，条件句使用了省略if的倒装句形式，动作与过去事实相反。

转载请注明原文地址:https://tihaiku.com/zcyy/3161208.html

相关试题推荐

随机试题

最新回复(0)

HowmanypairsoftwinsdidDr.Jarvik’sstudiesinvolved?[br][originaltext]