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：考查介词：cure sb of sth治疗某人的病，have a bad effect on sb对…有不好的影响，选C。句意是：虽然这种药能治疗你的病，但对你有副作用。