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—Someone is knocking at the door. Is it Ann?
—It _____ be her. She is giving a performance at the theatre now.
A.mayB.mustC.can’tD.mustn’t
C
may 可以,可能,表示推测与其;must必须,一定;can’t不可能,可能不;mustn’t禁止。句意:有人正在敲门。是安吗?联系下文,现在她正在剧院演出。可知前文指的是不可能是她。故选C。
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