My brothers are all college students是主系表结构的句子。A.The school adviser helped me choose suitable subjects.为主谓宾结构；B.Mr.Wang used to teach himself Japanese.是一个主谓宾结构的句子；C.His goal is to look after homeless children.是一个主系表结构的句子；D.He is looking for problems on his broken car.是一个主谓宾结构的句子。 故选：C。
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