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

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

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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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