It is impolite to sit there with your feet at somebody.
A. pointing
B. pointed
C. being pointed
D. point
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(答案→)A. pointing
B. pointed
C. being pointed
D. point
解析：考察with复合结构。本句中with的宾语your feet与动词point at之间构成主动关系，故使用现在分词doing的形式。句意：脚指着别人坐在那里是很不礼貌的。故A正确。