2. 外语
  3. The millions of calculations involved, ______by hand, would have lost all practical value by the time they were finished.

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

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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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