----look,Ann is on the playground over there.----- It______b

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----look,Ann is on the playground over there.----- It______be her,because shi is still in hospital
A.may be B.mustn't C.should D.can't

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 Look!There ___ some boys on the playground.A.are B.is C.have look!there is a girl .on the playground A runs B running C t look!there are seven ——(run)on the playground. Look,there is _________old man in the playground.____old man Look!Jack is f____ a kite on the playground like,on,is,there,a,of,left,the,playground,the Look!There are ______ sleep on the hill over there. Look!there is a bridge( )the river.A.over B.below C.on D.und There is a rope on the playground.(改为特殊疑问 There is (a football match ) on the playground every saturda there is only _ people on the playground