请选择CBA,k/A(X+_;h2w:T,D.F4G Is this a ______?7_9r,c1h4d8i;J'](N6D3J
A. teacher’s office7_9r,c1h4d8i;J'](N6D3J
B. teacher office7_9r,c1h4d8i;J'](N6D3J
C. teachers office7_9r,c1h4d8i;J'](N6D3J