否：They didn't used to play basketball in the afternoon.
疑：Did they use to play basketball in the afternoon?
肯回：Yes, they did.
否回：No, they didn't.
或者
否：They usedn't to play basketball in the afternoon.
疑：Used they to play basketball in the afternoon?
肯回：Yes, they used.
否回：No, they usedn't.
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