2. 专升本
  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 have lost
C、would lose
D、should have lost
答案B
解析 句意：数以百万计的相关计算，如果由人工进行的话，到计算完成时早已失去了其实用价值。本题考查与过去发生的情况相关的虚拟语气中主从句的时态运用。从句用had+过去分词，主句用would十have+过去分词。
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