the key to solving problem 的to 为什么是介词?我想用the key to solve problem不定式做定语不可以吗

the key to solving the problem is to meeet the demand made by the customsthe key to solving 换成the key to solve 可以、吗? The key ___the problem is to meet the demand___by customersA.to solving,making Bto solving,made C,to solving,making D,to solve,made The key to solving the problem The key to solving the problem .---How do you deal with a disagreement between the company and its customers?---The key to solving the problem is to meet the demand made by the customers 为什么是the key to solving t The key to solving the problem .---How do you deal with a disagreement between the company and its customers?---The key to solving the problem is to meet the demand made by the customers为什么是the key to solving the problem?而不是to solve the the key to solving problem 的to 为什么是介词?我想用the key to solve problem不定式做定语不可以吗 --How do you deal with the.--The key ___the problem is to meet the demand____by the customersA to solving;making B to solving;madeC to solve;making D to solve ;madeB我也不懂 The key----the problem is to meet the demand made by the customers.A.to solve B.to solving选哪个,为什么 ---How do you deal with a disagreement between the company and its customers?---The key to solving the problem is to meet the demand made by the customers为什么是the key to solving the problem?而不是the key to solve the problem? the key to the the key to your 不定式修饰名词to动词都是要ing吗好像不是啊.但是为什么例句：the key to solving the problem is to.这里的是动词ing呢? Do you have difficultly-solving -the problems?为什么用solving不用to solve 英语翻译Without architectural theories the process of designing a structure remains in its purest form,simply solving a given problem.Design becomes a process of integrating its key ingredients,program and environment.The program (problem to be s The Key To My Heart the answer/key to翻译 见到一个句子: we will go a long way to solving the energy issues 为什么是solving? the key to door//谓语是to? LOVE IS THE KEY TO THE WORLD