You can make use of the differences to tell which country th

这里 which country the foreiners of your block are from。作动词tell 的宾语从句,在 从句中 which 作定语修饰 country ,宾语 从句的引导词要 提到句首 啊 ,which country 作介词 from 的宾语。就好比特殊疑问句 ,which country do you come from?变成宾语从句 就是 Can you tell me which country you come from 。道理是一样的。