单项选择题

A．$ 1.
B．$2.
C．$ 3.
D．$ 4.
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单项选择题
A．Never mind.B．Yes, thank you.C．Don’ t mention it.D．Yes, you can.
A．Never mind.
B．Yes, thank you.
C．Don’ t mention it.
D．Yes, you can.
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