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Themillionsofcalculationsinvolved,hadtheybeendonebyhand,allpracticalvalueebytimetheywerefinished.A.couldloseB.wouldhavelostC.mightloseD.oughttohavelost翻译句子,解释为什么选B

题目详情
The millions of calculations involved,had they been done by hand,_______all practical valuee by time they were finished.
A.could lose B.would have lost C.might lose D.ought to have lost
翻译句子,解释为什么选B
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答案和解析
这些上百万的计算,如果全都是人工计算的话,到它们被完成的时候就会完全失去实际价值了.
这里是虚拟语气.
因为描述的是未然的事情,所以要用would虚拟