问题描述：
一道英语中考题,请讲解下第二个空,
—Look!The man at the gate ______ be our head teacher.He is always standing there every morning.
—No,it ______ be him.He is having a meeting in the office now.
A．must；can’t B．must；mustn’t C．can’t；can’t
—Look!The man at the gate ______ be our head teacher.He is always standing there every morning.
—No,it ______ be him.He is having a meeting in the office now.
A．must；can’t B．must；mustn’t C．can’t；can’t
问题解答：
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