Is this problem （ ）the teacher explained yesterday为什么是the one不是that,最好有翻译,谢谢(⊙o⊙)

This problem is so difficult that we can't work it out.(保持句意不变）This problem is ____ difficult ____ us _____ work out. this is a （ ) problem This problem is very___for her. This Maths problem is difficult.I can't work it out.的同义句This Maths problem isn't ______ ______ ______ ______ to work out. He didn't know how to solve this problem.(保持句意基本不变）He (空三格) this problem. this problem is very difficult,but i want to have a 什么（以t开头) This maths problem is not easy.I can't work it out.RT To finish this maths problem is difficult(改成同义句） （）（）（） finish this maths problem __ __ THIS MATHS PROBLEM IS ! It is difficult () out this maths problem This problem is not above us . this problem is difficult and ---------- (bore). I don't think he can work out this problem alone (同义句转换）I don't think he can work out this problem _______ ______. You don't have an attitude problem,is my problem 高中英语题i can't work out this problem .it is a most difficult onei can't work out this problem .it is ____most difficult oneA.the B. a应该选B.a most difficult.为什么不是Athe啊. i don't know___with this problem it is too hard 为什么是what to do 不是how to do? I don't think ___ ___(打断) a friendship is a good way to solve this problem 改错：1.No one in our class could answer this problem .2.He doesn't think Tom is correct