学帮网It has been proved that his theory is practical 怎么变为 His theory has been proved ( )如题
来源：学生作业学帮网 编辑：学帮网 时间：2024/05/09 03:55:33
It has been proved that his theory is practical 怎么变为 His theory has been proved ( )
如题
to be practical
practical
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来源：学生作业学帮网 编辑：学帮网 时间：2024/05/09 03:55:33
It has been proved that his theory is practical 怎么变为 His theory has been proved ( )
如题
to be practical
practical