Out math teacher set such a hard test problem ______ none of

Out math teacher set such a hard test problem ______ none of our math teacher set such a hard test problem________none of Our teacher set us such a difficult math problem _we couldn' The teacher set so difficult an examination problem( )none o our teacher set us such a difficult maths problem we couldn' work out,put up 1.i thought hard,and______the math problem a how did you work out the math problem?A.to ask the teacher f the math problem is too hard to work ------out the math problem was so difficult that none of us could work 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