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, it(是不是少了it)would have lost all practical value 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
the million of calculations involved,had they been done by h
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