Did you swim across the river -----强调“当时”是否游过河了
Have you swum across the river?-----强调到“目前为止”是否有过游过河这样的经历
Did you swim across the river Have you swam across the river?这两句话有什么区别
Did you swim across the river Have you swam across the river?这两句话有什么区别
英语人气：364 ℃时间：2019-08-19 14:53:36
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