Had I known about this computer program, a huge amount of time and energy.
| A． | would have been saved | B． | had been saved |
| C． | will be saved | D． | was saved |
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Had I known about this computer program, a huge amount of time and energy.
| A． | would have been saved | B． | had been saved |
| C． | will be saved | D． | was saved |
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