请选择一种付款方式。
Please read the following questions about the course and select one(and only one)answer which fits your best .
请阅读下面的关于课程的问题，选择唯一一个你认为最好的答案。
Item types can be copied only from one folder to another. Please select a folder, and then try again.
条目类型只能从一个文件夹复制到另一个文件夹。请选择一个文件夹，然后再试。
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