The millions of calculations involved, had they been done by hand, ______ all pr

游客2023-11-15 65

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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