【正确答案】 C

【答案解析】make up one's mind：打定主意；下定决心。decide：决定。want：想。I can study any subject you want to．我能研究你想研究的任何一个课题。promise：许诺。You've got to promise me that you won't do that again．你得答应我不再干那种事。agree：同意。They might not agree with his opinion．他们可能不同意他的意见。