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、had lost
B、would lose
C、would have lost
D、should have lost
答案C
解析 考查与过去事实相反的虚拟语气中主句和从句的时态。本句中，从句省略了if而倒装，正常语序应为“if they had been done by hand”，从句的时态是过去完成时，因此主句的谓语形式应为would have done，所以选项C正确。
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