题文
It__________ long before we __________the result of the experiment.
| A．will not be ； will know |
| B．is； will know |
| C．will not be ； know |
| D．is ； know |
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It__________ long before we __________the result of the experiment.
| A．will not be ； will know |
| B．is； will know |
| C．will not be ； know |
| D．is ； know |
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