—Can I help you, sir? —______.
| A．Yes, you can help me | B．No, I don’t need any help |
| C．Of course, if you like | D．No, thanks, I’m being served |
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—Can I help you, sir? —______.
| A．Yes, you can help me | B．No, I don’t need any help |
| C．Of course, if you like | D．No, thanks, I’m being served |
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