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