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英语
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例句：1.Did Tom do his home work yesterday?When?
回答：I want to know if Tom did his homework yesterday.请问回答中的为什么要过去式did而不用单数第三人称does?
人气：490 ℃ 时间：2019-09-09 17:29:32
解答
因为这是个宾语从句 主句是一般现在时 从句该用哪个时态就是哪个时态了 有yesterday所以用一般过去时
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