单选题 He has got too much ______to worry about your problem.
A. on his mind B. out of mind
C. off his mind D. to his mind

【正确答案】 A
【答案解析】[解析] on sb's mind压在某人心头；out of one's mind精神不正常；off one's mind不再在某人心头；to one's mind据某人意见。根据句意，A最合适。