单选题 A(An) ______ is a person who knows a great deal about a particular subject and whose advice on it may be taken by others.
【正确答案】 B
【答案解析】[解析] 名词词义辨析。根据句中对空格名词的解释，能提出advice的只能是mentor(指导者，良师益友)。故答案为B。consul“领事”；elite“精英”；pundit“博学者”。