【正确答案】 C

【答案解析】make up one’S mind：下决心。decide也有这个意思。Mary has decided not to go with us．玛丽已经决定不跟我们去。时：试图。Mary will try to work harder．玛 丽会试图更努力。promise保证。You have to promise me that you won’t do that again你得保证以后不再干那种事。attempt：试图。This paper attempts to solve the problem from a different perspective．此论文试图从一个不同的角度解决这个问题。promise：许诺