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The millions of calculations involved,_____by hand, would have lost all practica
The millions of calculations involved,_____by hand, would have lost all practica
游客
2023-11-05
59
管理
问题
The millions of calculations involved,_____by hand, would have lost all practical value by the time they were finished.
选项
A、had they been done
B、they had been done
C、having been done
D、they were done
答案
A
解析
这是一句虚拟语气的句子,条件句使用了省略if的倒装句形式,动作与过去事实相反。
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