long has he been away?-( )A.2 hours before B.since 2 hours C.2 ho_英语解答

long has he been away?-( )
A.2 hours before B.since 2 hours C.2 hours ago D.for 2 hours

人气：397 ℃　时间：2020-03-28 23:21:29

解答

选D.for 2 hours
完成时态中时间 for接时间段,since接时间点.