Once he has , nothing can change his mind.
A. made up his mind
B. decided his mind
C. determined his mind
D. made his mind
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(答案→)A. made up his mind
B. decided his mind
C. determined his mind
D. made his mind
解析：考查固定词组，A. made up his mind下定决心D. made his mind决心，其短语made his mind to do sth意思“决心做某事”，句子意思“一旦他下定决心，什么也改变不了他的注意”