Usually people in Japan and korea ___ bow when they meet for the first time,A,are supposed to B,are supposed C,supposed D,supposed to选什么,为什么,什么意思

问题描述:

Usually people in Japan and korea ___ bow when they meet for the first time,
A,are supposed to B,are supposed C,supposed D,supposed to
选什么,为什么,什么意思

选A,be supposed to do sth 应该做某事