--Sorry, sir. I made a mistake again.
--_________. Practice more and you will do better.
| A．Never mind | B．I'm not sure |
| C．You're welcome | D．Don't mention it |
--Sorry, sir. I made a mistake again.
--_________. Practice more and you will do better.
| A．Never mind | B．I'm not sure |
| C．You're welcome | D．Don't mention it |
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