根据后面那人的话：...because she is still in hospital 可以看出这是一个语气肯定的否定猜测句,must be 用于语气肯定的肯定句中,用在否定句中时应为can't be,选D.(其他的选项may be ,should be 的语气不够肯定).
满意的话就给我分吧^-^.
----look,Ann is on the playground over there.----- It______b
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