My uncle______from the hometown for 5 years.We really miss him A.has left B.has been away 为什么A是错的,B是对的?A是过去完成时,而B是过去完成进行

My uncle______from the hometown for 5 years.We really miss him A.has left B.has been away 为什么A是错的,B是对的?A是过去完成时,而B是过去完成进行式啊,按B说的那么他不还在出国吗?