The millions of calculations (involved) , (had they) been done by hand, would (l

游客2025-05-09 15

问题 The millions of calculations (involved) , (had they) been done by hand, would (lose) all practical value (by the time) they were finished.

选项 A、involved
B、had they
C、lose all
D、by the time

答案 C

解析改为have lost。had they been done是对过去情况的虚拟，主句结构应用would have done。

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