—Look! The man at the gate be our headmaster. He stands there every morning.
—No, it be him. He is holding a meeting in the office now.
A. must； can’t
B. must; can
C. can’t; mustn’t
D. can’ t; must
网友回答
(答案→)A. must； can’t
B. must; can
C. can’t; mustn’t
D. can’ t; must
解析：考查情态动词表推测的用法。must表推测用于肯定句中,can表推测用于疑问或否定句中。根据题意应选A。