--Look! It ________ be the new woman manager.--It ________ be her. She has just left for Shanghai.A.can; mustn'tB.must; can'tC.must; mustn'tD.can't; must
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B解析解析：考查情态动词。从上下句句意“看!那肯定是那个新来的女经理。肯定不是她，她已经去上海了。”可以推测出上句是十分肯定的猜测，用must；而下句也是十分肯定的否定推测，只能用can't。mustn't在否定句中，意为“禁止”，不表示推测。故选B。本题难。