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这句句子中的of是什么语法功能?We know of wood having been used as building material since ancient times.
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这句句子中的of是什么语法功能?
We know of wood having been used as building material since ancient times.
We know of wood having been used as building material since ancient times.
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没什么功能吧...是个固定搭配
know of知道有...
know of知道有...
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