—Someone is knocking at the door. Is it Ann? —It____________be her. She is giving a performance at the theatre now.

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问题 —Someone is knocking at the door. Is it Ann?
—It____________be her. She is giving a performance at the theatre now.

选项 A、may
B、must
C、can’t
D、mustn’t

答案C

解析本题考查情态动词表推测的用法。根据题干she is giving a performance at the theatre now．可知她现在一定不在这儿。表推测时，英语中使用。must，may，might，may not和can’t，这五个词的语气依次递减。

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