2. 考研
  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、could lose
B、would have lost
C、might lose
D、ought to have lost
答案B
解析 本题考查虚拟语气。had they been done by hand是一个省略了连词if的倒装的虚拟条件句，时态为过去完成时态，即表示与过去事实相反，故主句和谓语应该用would have done的形式，故答案为B项。
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