题目内容
【题目】—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
【答案】A
【解析】考查情态动词的用法。must用于肯定句中表示有把握的肯定推测；can’t意为“不可能是”，表示有把握的否定推测。所以答案是A
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