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英语翻译The millions of calculations involved,had they been done

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英语翻译
The millions of calculations involved,had they been done by hand,all practical value WOULD HAVE LOST by the time they were finished.大写的是正确选项.麻烦翻译一下这句话,能解析一下就更好了.
这是我上次答的一道一模一样的题的答案 你参考一下吧
选C 原句是过去式虚拟语气的倒装句 可以写为
the million of calculations involved,if they had been done by hand,all practical value would have lost by the time they were finished
从句为过去完成 主句为 would +have+done
翻译为
这包括上百万到运算 如果他们全用手算 那么当他们算完时 其中的意义便全无了