问题描述：
tie up这个短语既可以及物,也可以不及物吗
例如：He tied up the horse and went into the inn.
The horse has been tied up by him
第一句及物,第二句不及物?
例如：He tied up the horse and went into the inn.
The horse has been tied up by him
第一句及物,第二句不及物?
问题解答：
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