选择合适的句子，补全对话。
A Certainly. Let me help you.
B. It's kind of you.
C. Yes, of course.
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A: Good morning, Lisa. Would you please hold this box for me?
B:
1．A: Thanks a lot. Oh, I don’t have my English book with me today. Can I borrow your book?
B:
2．A: Thank you very much.
3． 
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