摘要： A．sorry B．welcome C．thank
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— Thank you, Mark.
— ____________
— ____________
| A．Yes, of course. | B．You’re welcome. |
| C．I’m sorry. | D．Goodbye. |
--- Can I help you? --- .
A．Thank you B．Yes, please, I want a pen. C．You’re welcome. D．I’m sorry.
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