tim has been in australia for six months .his brother hasn"t

tim has been in australia for six months .his brother hasn"t tim has been in australia for six mouth.his brother hasn't s Tim has been in Australia.His brother hasn't seen him( ) Jan He has been there for six months. My brother ha He has been there for six months 和 My brother has never been He has been there for six months. He has been there for six months Tim is in Australia.He went ___Australia six months ago.是填to his young brother once wrote to him in 2005,and 〔hasn't been 请高手详细分析Though my brother has been in Australia for a year,he He has been there for six months这里的has been是什么时态 Davy has never been to Australia._____?A.hasn't he B.doesn't