单选题 Experts believe that North Korea and South Korea ______ reunite one day.
A. may B. have
C. had D. are able to

【正确答案】 A
【答案解析】[解析] 表示对one day(有一天,某一天)不确定的未来的事进行推测的,所以表示推测的助动词may是正确答案。
词汇:reunite重聚