来自刘天佑的问题
theyapologizedfor()toattendthemeetingAtheirnotbeingableBtheirbeingnotableAgroupofstudentareplayingviolinther,()theirteacherasaccnductorAinfrontofthemstandBinfrontofthemstandsCinfrontofwhomstandsDinfron
theyapologizedfor()toattendthemeeting
AtheirnotbeingableBtheirbeingnotableAgroupofstudentareplayingviolinther,()theirteacherasaccnductorAinfrontofthemstandBinfrontofthemstandsCinfrontofwhomstandsDinfrontofwhomstand
