Question

The millions of calculations needed, had they been done by hand, ________ all practical value by the time they were finished．

[　　]

A．

had lost

B．

would lose

C．

would have lost

D．

should have lost

Answer 1

答案：C
解析：

句意：如果人工进行包含数百万次的计算，等结果出来，它也失去了价值。由于从句中省略了if，故而助动词提前，与过去事实相反，所以选C项。