【单选题】An English exchange student in your college is learning Chinese, but he often uses 你好 when he speaks to your professors. What do you think or say?
A.
Isn’t he funny when he makes silly mistakes?
B.
I wonder if he knows the professors really well.
C.
“It’s very rude to use 你好 when you speak to a professor. You should show more respect.”
D.
“Your Chinese is excellent. By the way, you might like to say 您好 when you speak to your professors.”