SHE IS BUSY.SHE...AT HER OFFICE NOWA

18. - DE KIEM TRA LOP 10 HE 3 NAM LIEN MAPDE KIEM TRA LAI LOP 10 2007DOC
DE KIEM TRA LOP 10 HE 3 NAM LIEN MAPDE KIEM TRA LAI LOP 10 2007DOC

18.She is busy.She...at her office now

A: works B: is working C: work D: to work