单选题 The sale usually takes place outside the house, with the audience ______ on benches, chairs or boxes.
A. having seated B. seated
C. seating D. having been seated

【正确答案】 B

【答案解析】seat这一动词的用法是seat oneself，所以audience were seated on benches...，此处表示一种状态，用过去分词即可。