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英语
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不是说前后时态保持一致吗?为什么在句子 Did you have a good trip last month?中did是过去式,have是原型
人气:120 ℃ 时间:2019-08-18 03:53:03
解答
Did 是助动词 have是实意动词.有了助动词,实意动词用原型
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