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May I speak to Dr. Brown?（）

A.Yes, he is not in at the moment.
B.No, you can't.
C.Yes, this is Brown speaking.
D.Sorry, speaking.

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May I see your tickets, please？（）

A.No, they are mine.
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May I see your tickets, please?（）

A.Sure.
B.No, you can't.
C.No, they are mine.
D.Yes, you can.