[SumireSatoh]

I think your teacher tried to say 'Kore wa dokono kuni no, doko no machi desuka?'=「これは、どこの国の、どこの町ですか/どこの街ですか？」＝Which town/city in which country is this?

これはThis
どこの国のof which country
どこの町(街)which town/city
ですか？interrogative