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I had a hamburger and a cola for lunch yesterday.(划线提问)划线为a

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I had a hamburger and a cola for lunch yesterday.(划线提问)划线为a hamburger and a cola
答案是:what did you have for lunch yesterday?但我不明白的是did为什么不变成do呢?在疑问句中动词的过去式不是要还原吗?谢谢帮我解答
I had a hamburger and a cola for lunch yesterday.(划线提问)划线为a
因为是过去时态,所以助动词是did
相似疑问句中的助动词的时态也要根据动作具体发生的时间来确定