B.情景反应 听句子，选择恰当的应答。（读一遍）
( ) 7. A. Good morning. B. Fine, thank you.
C. You're welcome.
( ) 8. A. It doesn't matter. B. Don't mention it.
C. That's right.
( ) 9. A. Well done. B. Good idea. C. No, thanks.
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