问题描述：
You had your singing contest in your school last week
改为反意疑问句是didn' you还是hadn't you
为什么有的时候had是用didn' you,有的时候用hadn't you
改为反意疑问句是didn' you还是hadn't you
为什么有的时候had是用didn' you,有的时候用hadn't you
问题解答：
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