A、It will be postponed. B、It will be put off. C、It will take place as arranged. D、It will be cancelled. D本题的问题关键词是what。由于教授要出差，

W: Does your brother feel any better today?
M: He is much better now, thanks. He should be coming home next week. The operation was a success, and he will recover very soon.
Q: Where is the brother now?

W: Professor Smith will take a visit to the University of Sydney, so his chemistry class will be called off next week.
M: OK. I will go and inform the whole class of it.
Q: What do we learn about the chemistry class?