下面句子中可以根据单词的构词法猜测划线部分单词的词义的是() A: Mr.Brownisanamateurphotographer．Heisanengineer．Butinhisfreetimehelikestotakepictures． B: Heisaresoluteman.Oncehemadeuphismindtodosomething,hewon’tgiveituphalfway. C: Ishallpersuadehimtotakethepainkiller.