作业帮It has been proved that his theory is practical 怎么变为 His theory has been proved ( )如题
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It has been proved that his theory is practical 怎么变为 His theory has been proved ( )如题
It has been proved that his theory is practical 怎么变为 His theory has been proved ( )
如题
It has been proved that his theory is practical 怎么变为 His theory has been proved ( )如题
to be practical
practical