单选题
The millions of calculations involved, had they been done by hand, _____ all practical value by the time they were finished.无
A、
had lost
B、
would have lost
C、
would lose
D、
should have lost
【正确答案】
B
【答案解析】
句意： 涉及到的数以百万计的计算， 如果是手工完成的， 那么在完成的时候它们就会失去所有的实用价值。 本题考查虚拟语气， 与过去情况相反， 主句用would have done， 因此本题的正确答案为B。
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