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—Look! The man at the gate ________ be our headmaster.

—No, it _________ be him. He is holding a meeting in the office.

A. must, can’t     B. must, mustn’t    C. can, can’t     D. can, mustn’t

—Look! The man at the gate ______ be our headmaster. He is always standing there every morning.
—No, it ______be him. He is holding a meeting in the office now.

—Look! The man at the gate ______ be our headmaster. He is always standing there every morning.

—No, it ______be him. He is holding a meeting in the office now.

A．must, can’t                           B．must, mustn’t

C．can’t, can’t                          D．can’t, mustn’t

—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