2. 外语
  3. The millions of calculations involved, if they had been done by hand, all practical value have lost by the time they were finish

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

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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.
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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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