◎ 题干
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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“The calculations, had they been done by hand,all practical value by the time they were finished. [ ]A. had lostB. would loseC. should have lostD. would have…”主要考查了你对  【情态动词】【虚拟语气】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。