. 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.

1. A.
   could lose
2. B.
   would have lost
3. C.
   might lose
4. D.
   ought to have lost

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

A. could lose         B. would have lost         C. might lose                D. ought to have lost

. 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.  

A. could lose      B. would have lost                          C. might lose           D. ought to have lost