People in Japan are supposed to bow when meet for the first timeA. themB. theyC. their

问题补充：

People in Japan are supposed to bow when meet for the first time.

A. themB. theyC. their

答案：

解析：考查代词。when meet for the first time，是一个状语从句，从句中缺少主语。要用主格人称代词作主语。所以选B。