The first (A) man swim (B) across the (C) river will receive a prize (D).
B
【译文】第一个游过这条河的人会得奖。 本题考查非谓语形式。现在分词可以作定语修饰名词,句子中真正的谓语应为will receive,所以swim应用非谓语形式,应更改为swimming。