The millions of calculations involved, if they had been done by hand, all practi

游客2023-11-29 56

问题 The millions of calculations involved, if they had been done by hand, all practical value have lost by the time they were finished.

选项

答案虚拟语气错误，应在have前加上would。

解析本句包含了与过去事实相反的虚拟条件句，从句谓语动词使用了had+过去分词，主句谓语动词应使用would／could／should／might+have+过去分词。句意为“如此之大的计算量，如果用手工计算的话，等到完成的时候也失去了所有的实用价值。”根据句意，在have前加上would最合适。

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