Shenzhou-VIII has docked with Tiangong-I successfully, _____ the start of the establishment of China's own space station．
| A．marked | B．to mark | C．marking | D．having marked |
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Shenzhou-VIII has docked with Tiangong-I successfully, _____ the start of the establishment of China's own space station．
| A．marked | B．to mark | C．marking | D．having marked |
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