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---Listen! Is Kitty in the next room?  ---No, it ______ be Kitty. She has gone to Beijing.
A.may notB.can’tC.mustn’tD.needn’t
B
情态动词辨析。may not可能不,可能小于can’t;can’t 不可能; mustn’t 禁止;needn’t不必。句意:听,是凯蒂在隔壁吗?——不,不可能是凯蒂。她去了北京。故选B。
表示否定性的推测要用can’t。
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