--I have a fever. –Oh you should .A. take a walk B. see a dentist C. drink more water

问题补充：

--I have a fever. –Oh, you should .

A. take a walk B. see a dentist C. drink more water

答案：

解析：fever是发烧的意思，题意是我发烧了，噢，你要。。。A答案是走一走不符合题意故排除A，B答案是看牙医与题意无关，故排除，C答案是多喝点水与题意比较贴切故选C