单选题 Their business flourished at its new location a year later owing to their joint efforts and hard work.

【正确答案】 C

【答案解析】[解析] flourish“繁荣兴旺”。prevail“流行”，指有势力、有影响；fail“失败；破产”；boom“迅速成长”，指日益繁荣；shrink“收缩；减少”。