THE CLASSROOM ____________ WHEN THE TEACHER ARRIVED

10. - DE THI MAU KHONG DAP AN 2014 MÔN TIẾNG ANH
Tiếng Anh DE THI MAU KHONG DAP AN 2014 MÔN TIẾNG ANH
10. The classroom ____________ when the teacher arrived .A. was being cleaned B. is cleaned C. was cleaning D. was cleaned