----look,Ann is on the playground over there.----- It______be her,because shi is still in hospitalA.may be B.mustn't C.should D.can't
问题描述：
----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
答
D
那不可能是她，她还在医院里。
表肯定时用can,否定用mustn't
答
b mustn't 根据语境 表示百分之百的否定
答
d
答
B很确定的否定
答
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^-^.