Professor First of all allow me to introduce Professor John Brown from Cambridge. Student

Professor First of all, allow me to introduce Professor John Brown from Cambridge. Student:______

A．Hello, Mr. Brown. Are you a doctor？

B．Moming, Prof. Brown. May I have a question？

C．Hi, Prof. John Brown. Can I ask what your specialty is？

D．Hello, Mr. John Brown. What brings you here？

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