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 lost
C、would have lost
D、should have lost

答案C

解析 根据had they been done可知此处是对已做过的事情的一种假设,故选C。
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