【題目】—I saw your mother in the library just now.—It ______ be her. She went to Beijing yesterday.
A.can't
B.mustn't
C.needn't

【答案】A
【解析】句意：－我剛才在圖書館里見到你媽媽了。－那不可能是她。她昨天去北京了。A. can't不能，不可能；B. mustn't不準，禁止；C. needn't不必。本句表示推測，因為昨天去了北京，所以“不可能”是好。故選A。

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