Scientists and experts said it was a big ________in China's space history that Chang'e-II has been smoothly sent around the moon.
| A．leap |
| B．chance |
| C．time |
| D．opportunity |
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Scientists and experts said it was a big ________in China's space history that Chang'e-II has been smoothly sent around the moon.
| A．leap |
| B．chance |
| C．time |
| D．opportunity |
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