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、might lose
C、would have lost
D、ought to have lost
答案C
解析 虚拟语气用在条件句中表示对过去的假设，从句使用过去完成时，主句使用“would(should， could，might)+have done"，如：If natural resources had been fully utilized，industry would have developed more rapidly．如果自然资源得到了充分利用，工业的发展本可以更快些。
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