◎ 题干
—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
◎ 答案
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◎ 解析
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◎ 知识点
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