--When you the bike.--Last month.

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 06:08:41

--When __ you __ the bike.--Last month.
填did;buy,为何have ;bought不行,句中有说到时态吗?

句子还原后面的回答是 I bought the bike last month ,有具体的过去时间状语,句子的时态就是过去时.
要是用have 的话就不是bought 而是 have had

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