The millions of calculations involved, ______ by hand, would have lost all pract

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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、having been done
C、they had been done
D、they were done

答案 A

解析虚拟语气。空格处为虚拟条件句了连词if，那么要部分倒装。

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Since1970,millionsofenthusiasts______asubstancewhichtheybelievecanre