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