The lecture，__________ at 7： 00 last night, was followed by an observation of the moon with telescopes.
| A．starting |
| B．being started |
| C．to start |
| D．to be started |
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The lecture，__________ at 7： 00 last night, was followed by an observation of the moon with telescopes.
| A．starting |
| B．being started |
| C．to start |
| D．to be started |
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