【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 up．玛丽已经决定不跟我们去。try：试图。Mary will try to work harder．玛丽会试图更努力。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。