It was dangerous for you to swim in that river. Youeaten by the fish.A. might have beenB.

问题补充：

It was dangerous for you to swim in that river. Youeaten by the fish.

A. might have been

B. must have been

C. could have been

D. should have been

答案：

A. might have been

B. must have been

(答案→)C. could have been

D. should have been

解析：考查情态动词。A也许已经做了；B一定做了；C可能做了；D本应该做实际上却未做；C项与A项是近义词，但是C项的语气更强。句意：在那条河里游泳很危险。你有可能会被鱼吃掉。根据句意说明C正确。