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

游客2025-04-01 21

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

解析本题测试虚拟语气过去时，had they been done by hand意为“如果用手计算的话”为省略if的虚拟条件句，所以主句应选would have lost。

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