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

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

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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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