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---Do you know why Anna hasn’t come to school today?
---I’m not sure. She _______ be ill.
A.canB.shouldC.mustD.may
D
考查情景交际。Can“可以,可能”,表示理论上的可能性,可能性比may大;should“一个”;must“一定”;may“可能”。“你知道为什么安娜今天没来学校吗?”“我不确定。她可能生病了。”根据“I’m not sure.”可知,“我”不确定。故选D。
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