单选题 Eye doctors recommend that a child’s first eye exam ________ at the age of six months old.
【正确答案】 B
【答案解析】recommend建议，其后常接that引导的宾语从句，而宾语从句中要用sb.shoulddo或者sth.shouldbedone的形式，should常可省略。故本题应选B项。