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The millions of calculations involved, by hand, would have lost all practical value by the time they were finishedA、had they been doneB、they had been doneC、having been doneD、they were done

The millions of calculations involved, by hand, would have lost all practical value by the time they were finished
A、had they been done
B、they had been done
C、having been done
D、they were done

发布时间：2025-07-11 03:45:15

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答案：C.having been done

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