— Can you come to my birthday party tonight?

— I’d love to, but I______ on a patient at 6 o’clock.

A．will operate

B．am operating

C．will be operating

D．will have operated

有位学生讲几片纸屑随意扔在走廊上，王老师路过时顺手捡起并丢进垃圾桶，该学生满脸羞愧。王老师的行为体现的职业道德是( )

A．廉洁奉公

B．为人师表

C．爱岗敬业

D．热爱学生