单选题：You will hear a long dialogue on checking in.For each questi

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题目类型：单选题
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题目内容：

You will hear a long dialogue on checking in.For each question , mark one letter (A, B or C) for the correct answer.
After you have listened once, replay the recording.
Why has Luke been busy? A．Lots of guests have been checking out.
B．He's had lots of guests' complaints.
C．Lots of conference delegates have been checking in.

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