Using a modal auxiliary:I have every reason to believe that she

Using a modal auxiliary:
I have every reason to believe that she is a fine girl.
【正确答案】：She must be a fine girl.
【题目解析】：I have every reason to believe that…我完全有理由相信，确信……，可用must替换。Must表示推断，指具有较大的可能性。常与be连用（否定句用can?not?be），必定、很可能。