--John may I ask you a favour? --________[A] I’m sorry but why?[B] Sure what is

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--John, may I ask you a favour? --________

[A] I’m sorry, but why?

[B] Sure, what is it?

[C] Yes, you could.

[D] I’d love to, and I’m busy.

请帮忙给出正确答案和分析,谢谢!

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