i wonder how long has he been away from australia 为什么不是i won

i wonder how long has he been away from australia 为什么不是i won 选择题-how long has he been away?-( ) I want to know how long () A.has he been back B.has he been long has he been away? long has he been away?-( ) 为什么Could you tell us how long he has been away?和Could you te He has been away ____A.How long B.How often C.How soonD.How He has been to Canada. So have I. 这里为什么不是 So has been I 呢 I want to know how long _______? A. has he been back B he ha 为什么是How long has he been there 而不是How long has he gone there 1.I want to know how long _.A.has he been backB. I 've been away from shanghai for3 days"是被动语态吗?为什么能用have(has