The patient was warned oily food after the operation..
A. to eat not
B. eating not
C. not to eat
D. not eating
网友回答
A. to eat not
B. eating not
(答案→)C. not to eat
D. not eating
解析：warn sb not to do sth警告某人不要做某事。句意，病人被警告手术后不要吃油腻食品。故选C。注意:非谓语动词的否定，直接在非谓语动词的前面加not.