The sale usually takes place outside the house ，with the audience on benches，chairs or box

网友回答

A. having seated
B. to seat
(答案→)C. seated
D. seating
解析：考查非谓语动词。sit 是主动，如果用seat就是被动，因为sit是动态的“坐”，而seat是表状态，静态的坐，所以正确的表达应该是sb be seated on sth。所以这里主要表状态，用的seat，就要用过去分词。选C。