题目内容：
听音频：{MP3:/imgcache/attached/media/20140228/20140228163450_8214.mp3}回答题：
What is the woman’s reply? A．She knows Professor Arnold has come．
B．J She thinks Professor Arnold has checked in．
C．She is sure that Professor Arnold has arrived．
D．She doesn’t know whether Professor Arnold has arrived．
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答案解析：