who is the boy wearing a hat?
答案:mine.结合上下文句意,可知是说本是我的一个朋友,用名词所有格,a frind of my friends,my friend=mine名词性物主代词,故答案是mine.扩展阅读:xbox series x ... this is my ... texas instruments ... the boyz echo ... boys planet 2023 ... which boy ... three storybooks ... boy london ... the boyz kevin ...