单选题 Bill doesn't ______what people say about him. He'll go on just the same.
【正确答案】 A
【答案解析】解析：care vi.关心，介意(一般用于否定句或疑问句中)。concern vt．使关心，使挂念。worry v.(使)担心，(使)发愁(about)。trouble vt．使烦恼，使苦恼；麻烦，费神。