5. By the time their friends have arrived, the
ein couple will have decorated the room.

A) As soon as the couple starts decorating the room, their friends will turn up.
B) When their friends turn up, the decoration of the room will have been finished by the couple.
C) It will take the couple a long time to finish the decoration of the room before their friends have turned up.
D) The couple will still be decorating the room after their friends have come.
E) Until after their friends arrive, the couple won't have completed the decoration of the room.