we had to___ to solve the maths problem A.tried our best B.t

we had to___ to solve the maths problem A.tried our best B.t we had to___ to solve the maths problem A .tried our best B. Jenny tried _______to solve the maths problem(succeed) The determined boy tried his best to solve the problem,_____ 帮我检查:He tried his best to solve the problem,( ) He tried his best to solve the problem,_______difficult it w He tried his best to solve the problem __difficult it was 为什 He tried his best to solve the problem,however difficult it ___difficult the problem was,he tried his best to solve it. He tried his best to solve the problem,______ difficult it w This is the best way i think of()the problem A.solve B.to so I tried my best to work out the maths problem but I failed.同