You never told us why you were late for the party ? weren't you didn't you did you were you为什么是c不是d 我知道never是否定,前否后肯

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You never told us why you were late for the party ? weren't you didn't you did you were you
为什么是c不是d
我知道never是否定,前否后肯

因为这是对主句 反问
主句是行为动词一般过去时的否定形式 所以用did you
不用were you.因为它不是行为动词的疑问形式 而是be动词的疑问形式