He has been away ____A.How long B.How often C.How soonD.How
He has been away ____A.How long B.How often C.How soonD.How far He has been away ____ 说明理由 A.since a month B.for a month C.for a month ago D.in a month 说明理由为什么选C不对? 那说He left for a month ago