问题描述：
through ,over,across的区别,填空题
Don't throw about garbage( )the window,please.
The Great Wall runs over 9,000kilometres( )the northen China.
There used to be a stone bridge( )the river.
用这三个词填空
Don't throw about garbage( )the window,please.
The Great Wall runs over 9,000kilometres( )the northen China.
There used to be a stone bridge( )the river.
用这三个词填空
问题解答：
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