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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