请选择DCBA3Y8Z;}0E8|8a4g+\7R_____ you see the blackboard?4|3a:Z0u*r+d*r
A. Do4|3a:Z0u*r+d*r
B. Are4|3a:Z0u*r+d*r
C. Is4|3a:Z0u*r+d*r
D. Can4|3a:Z0u*r+d*r