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单选题
When will the professor speak?
A
At 12:00.
B
At 11:45.
C
At 12:45.
参考答案
参考解析
解析：
录音提到Lunch will be served at 12:00 and Professor Smith will speak at 12:45，即C项正确。
录音提到Lunch will be served at 12:00 and Professor Smith will speak at 12:45，即C项正确。
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