___(buy) a beautiful pen.-When did you bu___(buy) a beautiful pen.-When did you buy it?空格中是bought 还是have bought?我觉得都可以,

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___(buy) a beautiful pen.-When did you bu___(buy) a beautiful pen.-When did you buy it?空格中是bought 还是have bought?我觉得都可以,
___(buy) a beautiful pen.-When did you bu
___(buy) a beautiful pen.-When did you buy it?空格中是bought 还是have bought?我觉得都可以,

___(buy) a beautiful pen.-When did you bu___(buy) a beautiful pen.-When did you buy it?空格中是bought 还是have bought?我觉得都可以,
bought 用于一般过去时,这里用bought 比较符合常规!