— Who's that man in our classroom? It ________ be Mr. Brown. He is much taller. — You mean the man in white? He is an exchange student from England.
A:can
B:may
C:can't
D:mustn't
“常思奋不顾身,而殉国家之急。”下列观点蕴含的文化道理与之不一致的是