只要你不断努力,你迟早会解决这个难题的。
A.As long as you keep on trying, you will be able to resolve out this difficult problem sooner or later. B.As long as you keep on trying, you will be able to resolve this difficult problem sooner or later. C.As long as you keep for trying, you will be able to resolve out this difficult problem sooner or later.正确答案B
