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The millions of calculations involved, ______by hand, would have lost all practi
The millions of calculations involved, ______by hand, would have lost all practi
游客
2023-11-17
25
管理
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
该题是语法结构题，考查虚拟语气的用法。在该句中，虚拟语气用来表示与过去事实相反的情况，主句用would have done形式，从句用had done形式。引导非真实条件句中的引导词if被省略了，助动词had提前，所以出现了had they been done这样的倒装结构。因此，根据题意和语法规则，选项A为最佳答案。
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