根据对话和问题，选出正确答案。

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1. (2020八上·重庆期中) 根据对话和问题，选出正确答案。

Must I see a dentist when I have the toothache?<br />You don't have to, Sam. You can take some medicine.<br />Question.<br />Must Sam see a dentist when he has a toothache?

A . Yes, he needs to. B . No, he mustn't. C . No, he needn't.

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