问题描述：
用适当的人称代词主格形式完成对话
A:Good afternoon.How are ( B:( )am fine,thank you.A:You're a teacher,aren't( B:Yes,I am.
A:Good afternoon.How are ( B:( )am fine,thank you.A:You're a teacher,aren't( B:Yes,I am.
问题解答：
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