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The calculations, had they been done by ...

The calculations, had they been done by hand, ______all practical value by the time they were finished.

A. had lost  B. would lose   C. should have lost  D. would have lost

 

D 【解析】 试题分析:句意:这些计算如果用手工进行的话,那么当他们完成后将失去所有的实际价值。句中had they been done是if they had been done的省略,是对过去的虚拟,所以主句谓语应该用would have done,选D。 考点:考查动词时态。
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