1、I ()(buy) a present for my mother last month

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1、I ()(buy) a present for my mother last month

1、I ()(buy) a present for my mother last month
1、I ()(buy) a present for my mother last month

1、I ()(buy) a present for my mother last month
bought,表示“上个月买的”,对“现在买不买”没有影响
have bought,表示“上个月买过了”,影响是“现在不必买”