现在完成时和过去完成时微课   分类:教育教学 | 上传于: 2021-02-20 20:48:02

现在完成时和过去完成时The old man hasn't returned to his hometown for about fifty years. 这位老人约有50年没有回家乡了 The meeting had started when we arrived at the hall 我们到达大厅时,会议已经开始了up now to since in for over 现在完成时过去完成时before 过去的时间段过去的时间点过去的时间点

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