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

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A. having seated
B. seating
(答案→)C. seated
D. having been seated 
解析：考查seat的用法。seat作为动词用时是及物动词,后面跟人。本题后面是一个with的复合结构,宾语是audience,作宾补的是seat,是过去分词形式,它们之间是一种逻辑上的动宾关系。