The lecture, ________ at 7：00 pm 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 pm 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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