People in Koreabow when they meet for the first time.A are suppose to B supposed to C are

问题补充：

People in Koreabow when they meet for the first time.

A、are suppose to B、supposed to C、are supposed to

答案：

解析：句意：当朝鲜人第一次见面的时候，他们应该鞠躬。are supposed to do sth 应该做某事，理应做某事，固定短语，故选C。