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Wehavestayedherefortwodays(改为否定句)为什么是We(haven't)(stayed)herefortwodays.而不是填hadn'tstay

题目详情
We have stayed here for two days(改为否定句)为什么是We (haven't) (stayed) here for two days.而不是填hadn't stay
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答案和解析
have不用换时态