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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