. — My cat’s really fat.— You have given her so much food. A. wouldn’tB. couldn’tC. shoul

问题补充：

. — My cat’s really fat.

— You have given her so much food.

A. wouldn’t

B. couldn’t

C. shouldn’t

D. mustn’t

答案：

A. wouldn’t

B. couldn’t

(答案→)C. shouldn’t

D. mustn’t

解析：shouldn’t have done的意思是“本来不应该做某事”。