单选题 (This) is the sportsman (whom) everyone says (will win) the first prize (at) the Winter Olympic Games.
A. This B. whom C. will win D. at

【正确答案】 B
【答案解析】[解析] 应改为who。who和whom都可以引导定语从句，但只有who可以作主语，此处缺少一个主语，所以只能用who，“everyone says”是插入语。