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---Someone is knocking at the door. Who may it be?
---It ______ be Tom. He is still in the school.
A.can’tB.mustn’tC.couldn’tD.may not
A

试题分析:句意:有人敲门。可能是谁呀?不可能是汤姆。他仍然在学校里。Can’t表示“不可能”;mustn’t表示“禁止做”,couldn’t表示“不能”,may not表示“可能不”。所以本题选A。
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