—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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