The millions of calculations involved, had they been done by hand, ______all pra

游客2025-03-20  2

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

选项 A、could lose
B、would have lost
C、might lose
D、ought to have lost

答案 B

解析 这是一个与过去事实相反的虚拟语气句,从句had they been done by hand插在主句中,采用倒装形式省略了连词if,表示非真实条件,主句中有明确的时间状语by thetime they were finished指过去,因此选择B。全句的意思是"所涉及的数以百万计的计算如果用手算的话,到算完时也就完全失去了实际价值了"。
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