单选 : ( ) none of us could solve the math problem,it is too d

单选 : ( ) none of us could solve the math problem,it is too d 单选 :( ) none of us could solve the math problem,it is too di ( ) none of us could solve the math problem,it is too diffic the math problem was so difficult that none of us could work The math problem is too diffcult for me to solve后为什么不能加it The problem is too difficult for us to solve it. 这个句子里面的it 为 The math problem is so hard that only ( ) of us can work it The problem is too difficult for us to solve.=The problem___ the math problem is _____ difficult for me ____ solve 1.The math problem is too diffcult.Could you help me________ 帮帮忙看看填什么~The math problem is too hard.N____among us can solv Violence could solve the problem?