–Howlonginshanghai?–Justtheweekend,I’vetobebackforani
–Howlonginshanghai?
–Justtheweekend,I’vetobebackforanimportantmeetingtobeheldnextMonday.
A.haveyoustayedB.areyoustayingC.didyoustayD.doyoustay为什么?