It's two years since I worked in Beijing.为什么不能用has worked?He worked in Africa on wild animals for eight years.为什么不能用had worked?Our work not finished ,we refused his offer.为什么不能用has not been finished?
来源：学生作业帮助网 编辑：作业帮 时间：2024/09/30 11:27:49
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