Since three Chinese astronauts piloted Shenzhou IX to link up with Tiangong-l, China's exploration of outer space has reached new stage．
| A．不填；a | B．the; a |
| C．a：the | D．不填：不填 |
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Since three Chinese astronauts piloted Shenzhou IX to link up with Tiangong-l, China's exploration of outer space has reached new stage．
| A．不填；a | B．the; a |
| C．a：the | D．不填：不填 |
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