Is this problem ___ the teacher explained last week?A whichB thatC the oneD one为什么选C而不选B或A

this is a （ ) problem 1.This math problem is more difficult than that one.This math problem ___ ___ ___ ____ that one.1.This math problem is more difficult than that one.This math problem ___ ___ ___ ____ that one.2.Mary is taller than the other girls in our class .Mary i This is ___ ___ ___ This problem is so difficult that nobody can work it out.It is ___ ___ ___problem_____nobody can work it out. ___(解决）this problem is more difficult than we think.请说明原因. Is this problem ___ the teacher explained last week?加THE呢 this is a problem that __ ___(要求） immediate solution. 4.There is,___,another side of this problem.but; however; yet; though This problem is very___for her. I don't think ___ ___(打断) a friendship is a good way to solve this problem This is ___ grandmother ---Is this math problem difficult? ---No, I can work it out ___ .A easily B friendly C really D differently Can you work out this maths problem?同义句___you___ ___ work out 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). Pat goes to school by bus every morning.（划线提问:by bus） ___ ___Pat___to school every morning?This math problem is too diffcult.(改为感叹句）___ ___this math problem is!