at the foot of the mountain was a lonely house ,( )owner seated under a big tre...

注意 sit(坐),和seat(座位) 的区别.He is sitting = He is seated.
如果用 whose,应该是:whose owner sits under...
独立主格做状语,当现在/过去分词的主语不同于句子主语时,分词的主语要另外写出来.

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