seat 的意思是“使坐下”,及物动词,表示就坐时,有两种:
be seated (on the chair /on beach/on the bed ……)
seat onself (on the chair/on bench /on the bed……)
在这个句子中,用“with+名词+分词”的结构做句子的状语。这种结构是分词的独立结构(简称:独立主格)的另一种表示形式。主句的主语是the performance,而状语中的主语是audience,两者主语不一样,所以采用独立主格。状语中的主语audience与谓语动词seat是主动关系,所以根据seat的短语搭配,可以有以下俩种表达:
The performance was put on in the open air, with audience (seated )on benches, chairs or boxes(这里省略了be)
The performance was put on in the open air, with audience (seating themselves) on benches, chairs or boxes
因为“with+名词+分词”的结构做句子的状语表示伴随状态,所以A选项时态错了(having seated 表示的是现在完成时)B选项少了themselves,D选项多了being
嘻嘻,好像说的有点多了……欢迎追问诺~~~