单项选择题

在本节中，你将听到15个对话，每段对话后有一个问题。请从A，B，C三个选项中选出答案，并标在试卷的相应位置。每段对话后有15秒钟的停顿，以便回答问题和阅读下一个问题。每段对话读两遍。 下面请听这些对话。 How long has Mr. Wang been here

A． He arrived here three hours ago.
B． He’s been here for an hour.
C． He came here half an hour ago.
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