2. 外语
  3. The millions of calculations involved, had they been done by hand, __________________(等到完成时恐怕早就推动了所有价值).

The millions of calculations involved, had they been done by hand, __________________(等到完成时恐怕早就推动了所有价值).

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问题 The millions of calculations involved, had they been done by hand, __________________(等到完成时恐怕早就推动了所有价值).
选项
答案would have lost all practical value by the time they were finished
解析 本题考查对虚拟语气用法的掌握以及对插入语的理解。had they been done by hand是一个省略了连词 if的倒装虚拟条件句(正常语序为if they had been done by hand)，并作为插入语放在了主句主语和谓语动词之间，从句谓语采用的是had done的形式，那么主句谓语则应采用would have done的形式。
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大学英语六级

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