The man in our classroommy English teacher. He went to Beijing this morning.A. mustn’t be

问题补充：

The man in our classroommy English teacher. He went to Beijing this morning.

A. mustn’t be B. can’t be C. may be

答案：

解析：本题是考查的是情态动词表示推测的语气，根据后文中的答语He went to Beijing this morning.，可知答案为B