单项选择题
W: Excuse me, visiting hours are over. It’s time for visitors to leave. M: I’m sorry, I didn’t know the time or I would have left earlier.
A．At the hospital. B．At the airport. C．At a school.
A．Beijing Theater. B．Beihai Cinema. C．Beihai Park.
A．Master and servant. B．Teacher and student. C．Fellow workers.