Lang Lang appeared at Beijing Olympic opening ceremony （开幕式），__________ in front of audience from all over the world.
| A．performing |
| B．performed |
| C．to perform |
| D．perform |
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Lang Lang appeared at Beijing Olympic opening ceremony （开幕式），__________ in front of audience from all over the world.
| A．performing |
| B．performed |
| C．to perform |
| D．perform |
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