at school / at home为什么不加定冠词The?另外,有那些常见的介词用法?at a factory这个更郁闷，为啥要定冠词a?这种如果我说错，比如说 at the school / at factory（或at the factory）会有问题吗？

来源：学生作业帮助网 编辑：作业帮 时间：2024/09/08 05:53:28
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