Jumping out of ______ airplane at a height of 5000 kilometers is ______ unforgettable experience.
| A．an ; a |
| B．an ; an |
| C．an ; / |
| D．a ; an |
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Jumping out of ______ airplane at a height of 5000 kilometers is ______ unforgettable experience.
| A．an ; a |
| B．an ; an |
| C．an ; / |
| D．a ; an |
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