Although this medicine can cure you your illness，it has a bad effect you.
A. for；in
B. for；on
C. of；on
D. of；at
网友回答
A. for；in
B. for；on
(答案→)C. of；on
D. of；at
解析：考查固定搭配。固定搭配Cure sb of sth治愈某人…病；have an effect on…对…有影响；句意：尽管这种药能够治愈你的病，它对于你也有负面的影响。故C正确。