At last,we found ourselves in a pleasant park with trees providing shade and____down to eat our picnic lunch.A sitting B having sat C sat D to sit
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At last,we found ourselves in a pleasant park with trees providing shade and____down to eat our picnic lunch.A sitting B having sat C sat D to sit 句中有and，所以选c。和前边found平行。没有and选a。
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选择C