单选题 He has ______ a very odd set of people. I hope they won't have a bad influence on him.
A. got mixed up with B. got involved in
C. lined up with D. come up with

【正确答案】 A

【答案解析】[解析] get mixed up with“与……混在一起”；get involved in“卷入……”；line up with...“成为……同盟者；与……联合”；come up with“赶上；提出”。