—I have a . What should I do mum?—Didn’t I tell you not to drink the sour milk?A. headach

问题补充：

—I have a . What should I do, mum?

—Didn’t I tell you not to drink the sour milk?

A. headache B. backache C. stomachache

答案：

解析：本题的回答语意思为难道我没有告诉你不要喝酸奶吗？回答语表示的和吃有关，吃通常和肚子有关，所以我可能是肚子疼，故选C。